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neeru . Grade: 11
        

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?

7 years ago

Answers : (1)

Badiuddin askIITians.ismu Expert
147 Points
										

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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Badiuddin


7 years ago
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