Question

A bullet shot into a target loses 1/4 of its initial velocity after passing through 15 ck. How much further will it move before coming to rest? (Assume constant force)

Answer 1

Explanation:

At half velocity velocity, the bullet’s kinetic energy is (1/2)^2 = 0.25 its value before striking the target. That is 0.75 loss. Assuming the energy loss is proportional to penetration distance and constant force, then 0.75 d = 15, so d = 15/0.75 = 20 cm. The bullet will penetrate another 5 cm.