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In an NCC traiign camp, a cadet fired a ...

In an NCC traiign camp, a cadet fired a bullet of mass 50 gram with a speed of 200m/s, on a soft plywood board of thickness 20 mm. It was found that the kinetic energy of the emerging bullet was only 25% of its initial K.E. What is the percentage decrease in the speed of the bullet?

A

0.25

B

0.5

C

0.6

D

755

Text Solution

Verified by Experts

The correct Answer is:
B
K.E. acquired by the body =Work done `="Force " xx" Displacement"`
`=20(N) xx 5(m)=100J`
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