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Question

Physics Question on Motion in a straight line

A bullet travelling horizontally looses 1/20th1/20^{th} of its velocity while piercing a wooden plank. Number of such planks required to stop the bullet is

A

6

B

9

C

11

D

13

Answer

11

Explanation

Solution

no. of planks = n22n−1\frac{n^2}{2n - 1}