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A bullet loses 10% of its speed after passing through a wooden plank.How many such planks should be placed one after the another so that bullet does not come out?

A bullet loses 10% of its speed after passing through a wooden plank.How  many  such planks should be placed one after the another so that bullet does not come out?

Grade:11

1 Answers

Badiuddin askIITians.ismu Expert
147 Points
11 years ago

Dear neeru

let the thickness of one block is t

(9v/10)2 = v2 - 2at

.81v2 = v2 - 2at

2at = .19v2.........................1

let n block is used

0 = v2 - 2a(nt)

n = v2 /2at

  = v2 /.19v2

  = 100/19

  = 5.26


so 6 block is used

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