Week 2-Graded Assignment-Question 3

[Sandesh Karande]

When Calculated the  Bullet will exactly hit at 90m from base of tower. The worker L is standing exactly at 90m. So the bullet may hit his legs and So I think he is not safe from the bullet. Definitely M is in danger as the bullet will hit at about his chest height but after passing through him the bullet will hit in foot of L. Then how is L safe?

Or are we have to assume that the bullet will not pass through one person and so further person remains safe. If this is the case then Option D. ("No one is safe" is misleading or confusing as one may infer from this option that bullet penetrates through one person and may hit the next worker if he too is in the projectile motion of bullet) 

Or we have to assume that the position of the worker starts at 90m (i.e. no part of his body is at exactly 90m not even his leg) and the position of the worker L will start from 90.01 m and the bullet hits exactly right before his leg lay on the ground

[Swati Jain]

Exact same problem & further 'safe' here means bullet not getting in any body part. 

On Tuesday, October 27, 2020 at 12:22:19 AM UTC+5:30 rabadiya...@gmail.com wrote:

Affirmative

I also got same query and answer 

Bullet hitting L foot.

If Bullet Hit M head/chest that doesn't mean it can't hit the L foot at same time.

Because their is no clarification in question. 

Ideally both are in danger.

Answer would have 

K & L are safe

Regards

Nikunj 

[Nikunj Rabadiya]

I also got same query and answer 

Bullet hitting L feet.

If Bullet Hit M head/chest that doesn't mean it can't hit the L feet at same time.

Because their is no clarification in question. 

Ideally both are in danger.

Answer would have 

K & L are safe

Regards

Nikunj 

On Tuesday, 27 October 2020 at 00:45:19 UTC+5:30 rupamwa...@gmail.com wrote:

Same issue! The trajectory of the bullet is suck that it can hit L's legs if bullet somehow penetrates or dodges M.

[Divya Gangaramani]

Yes I also marked the answer thinking that L and M both won't be safe. 

[Nikunj Rabadiya]

I also got same query and answer 

Bullet hitting L foot

If Bullet Hit M head/chest that doesn't mean it can't hit the L foot at same time.

Because their is no clarification in question. 

Ideally both are in danger.

Answer would have 

K & N are safe

Regards

Nikunj 

[Yaajneshini M]

Same doubt here too

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[Learn with Vidya]

I have the same exact problem!

I am attaching my copy of the solution process for this 3rd question. Please look at it and if the Moderator of this group could look at it and clarify what's the mistake, it would be great help. Thanks

Click here for the solution

[kshove...@gmail.com]

Yes, Even I have the same doubt.

The bullet coming in a straight line hits the legs of L and hence we cant think of L being safe from the bullet.

Course team please look into the same. 

[manu]

If bullet not penetrating M is considered definite possibility then it should've been stated in the question itself. One cannot generalise the nature of ballistic behavior of a bullet without the required parameters. To mark somebody safe their risk factor should be absolute zero. May or may not hit L but there is a possibility in case of penetration. Hence one cannot say L is fully safe. If expectation was to predict or expect the stoppage of the bullet. I would say although the hight of person is given one could question if he's standing or sitting. There are so many other ifs and buts for such assumptions. I think both the ans should be awarded as correct ans.

On Tue, 27 Oct, 2020, 12:45 am Rupam Wasekar, <rupamwa...@gmail.com> wrote:

Same issue! The trajectory of the bullet is suck that it can hit L's legs if bullet somehow penetrates or dodges M.

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[AC]

Respected Support team,

Please allow me to share my observations:

A simple update to the question on the bullet being stopped by the first person hit would have helped matters a lot!

Then the question of "safety" in the answer options would have been clear to all, I suppose.

I know find from the discussion threads that those who had sought that clarification previously were privy to that clarification.

I am feeling so left out :(

Best Regards,

Anirban

[Aditya Bisht]

Same doubt. As in question it is mentioned that who all are not safe which implies who are getting hit and not who are getting hit but hit is not fatal.As both M and L will get hit so both are unsafe. How fatal will be the shot is another concern, GETTING HIT IS NOT SAFE.

[Malabika Guha Mustafi]

https://groups.google.com/a/nptel.iitm.ac.in/g/ma1001-discuss/c/1vLWUBgl4VY/m/foAcxr87AgAJ

[Aditya Bisht]

The fact that bullets stops after hitting the first occurring Target is debatable as it becomes the question on the penetration capacity of the bullet, whose mention is done nowhere in the question. Hence the assumption that first occurring Target stops the bullet is an assumption and not a fact. Also if one sees the question in context of  'coordinate geometry', The question asked is that 'who all among the 4 will not be safe when bullet is fired'  which indicates to provide a sample space of all the points which lie on the line i.e (trajectory of the bullet). 

According to me what I have infer from all the information provided in the question was, All the points that lie on the trajectory of the bullet are unsafe, which makes M and L unsafe considering the fact no information about penetration capacity of the sniper bullet was provided.

[vignesh p]

Yes, we took this considering the fact that sniper's bullet can penetrate multiple personnel. Since details regarding the bullet's penetration capacity had not been given, L is also in danger

[Archita Singh]

Same here. Given the way the question has been mentioned, L is in danger too.

[Bapu Gayathri Maddisetty ae19b001]

Same doubt

[Anand Iyer]

Anirban's point is very valid.  

When it was discovered that the question needed clarification on the forum, the question should've been updated and an announcement made.

Team, hope that will be taken care of at least in future examinations.

[Madhu Nagaraju]

yah, i also got same doubt,

and i think when shot by a sniper then surely it will hit m and l's leg

On Tuesday, October 27, 2020 at 12:33:11 AM UTC+5:30 Swati Jain wrote:

[Manu Rai]

Same doubt

Since the question asks about " safe"  not " dead"  

Therefore answer should be N&K are safe.

[Aparna Behera]

Same understanding here....answer should be only K and N are safe.

@Support team - Please clarify.

On Tuesday, October 27, 2020 at 5:09:21 AM UTC+5:30 adity...@gmail.com wrote:

[satya takkellapati]

I agree. It would have helped if they mentioned that the bullet can only hit one person which would actually eliminate half of the options even before solving the problem. Besides if we faced the same question during the exam there will be no one to sought out an explanation from.

[swetha murali]

Same doubt from my end as well. M and L both are not safe.

Option should be K and N are safe.

[Debojyoti Basu Majumder]

Absolutely agree with you

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[Ayush Patidar]

I got the same answer. Bullet is hitting L's leg. So M and L both should not be safe. Also, there is no information about penetrating capability of bullet in the question.

[kumaravel...@gmail.com]

Dear Sir/Madam,

I think the answer is ambigious for the following reasons of inputs:

given, tan(theta)=m=2/3 (which is positive slope from the bullet point (0,60),

in such case, the slope of KLMN will all will be in negative slope (though slope of M - matches numerically as 2/3).

But, if the given information tan(theta)=-2/3, then the answer: Everyone is safe except M is Ok, otherwise for the given information of m=tan(theta)=2/3 can bring that all are safe.

Please confirm.

Thanks

Kumaravel Saravanan

[Abhishek Rajasekaran]

I feel the same as well. K and N should be safe.