Mechanics

Siddharth's Avatar
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10 Mar 2012 20:57:03 IST
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Kinematics
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a bullet loses 1/20th of its speed on hitting a plank. what are the least number of planks required to stop the bullet?



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kartikAIR1's Avatar

Blazing goIITian

Joined: 2 Mar 2012
Posts: 308
10 Mar 2012 22:26:07 IST
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infinite..##

New kid on the Block

Joined: 3 Mar 2012
Posts: 17
10 Mar 2012 23:27:58 IST
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Ans is 11

v2 - u2 = 2as         eq No 1  ( V=19u/20)

02 - u2= N 2as         eq no 2

div eq 2 by eq1

we get N =10.25

rounding it to11

Siddharth's Avatar

Cool goIITian

Joined: 4 May 2011
Posts: 48
11 Mar 2012 10:09:43 IST
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yes correct answer is 11. thnx for the method

Cool goIITian

Joined: 9 Jan 2012
Posts: 90
11 Mar 2012 14:12:22 IST
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ya



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