A bullet of mass 50g is moving with a velocity of 500ms−1. It penetrated 10cm into a still target and comes to rest. Calculate: (a) the kinetic energy possessed by the bullet. (b) the average retarding force offered by the target.
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Solution
Mass of bullet =50g=0.05kg
Velocity =500m/s
Distance penetrated by the bullet =10cm=0.1m
(a) Kinetic energy of the bullet =12×mass×(velocity)2
=12×0.05×(500)2
=12×0.05×500×500=6250J
(b) Work done by the bullet against the material of the tared = resistive force × distance 6250= resistive force ×0.1m