A rifle bullet loses 1/20^{th} of its velocit | vedclass

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Question

Therefore $0^{2}-u^{2}-2 a(n s)$

$u^{2}-2 a s(n)$

$u^{2}=n\left[u^{2}-19^{2} / 20^{2} u^{2}\right]$

$\mathrm{u}^{2}=\mathrm{nu}^{2}\left[20^{

Vedclass · Accepted Answer

$11$

Vedclass · Answer

Therefore $0^{2}-u^{2}-2 a(n s)$

$u^{2}-2 a s(n)$

$u^{2}=n\left[u^{2}-19^{2} / 20^{2} u^{2}\right]$

$\mathrm{u}^{2}=\mathrm{nu}^{2}\left[20^{2}-19^{2} / 20^{2}\right]$

$20^{2}-n\left[20^{2}-19^{2}\right]$

$20^{2}-n[(20+19)(20-19)]$

$n=400 / 39$

$n-11$ planks

A rifle bullet loses $1/20^{th}$ of its velocity in passing through a wooden plank. The least number of planks required to stop the bullet is :-

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