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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?

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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