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A bullet of mass 20 g has an initial spe...

A bullet of mass 20 g has an initial speed of `1 ms^(-1)` just before it starts penetrating a mud wall of thickness 20 cm. If the wall offers a mean resistance of `2.5 xx 10^(-2)N` the speed of the bullet after emerging from the other side of the wall is close to:

A

`0.7 ms^(-1)`

B

`0.4 ms^(-1)`

C

`0.1 ms^(-1)`

D

`0.3 ms^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
A
`a = (-2.5 xx 10^(-2))/(20 xx 10^(-3)) v^(2) = u^(2) + 2as = 1^(2) - (2 xx 2.5 xx 10^(-2))/(20 xx 10^(-3)) xx 20 xx 10^(-2) = 0.5`
v square 0.7 m//s`
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