Question

a bullet initially moving with a velocity of 25m/s strikes target and comes to rest after penetrating a distance 15cm in the target calculate the retardation caused by the target​

Answer 1

Concept :-

When the body is traveling and doesn't changing its velocity with respect to time then it is moving with initial velocity only.

Given :-

Initial Velocity of bullet = u = 25 ms-¹

Distance travelled = S = 15 cm = 1.5 m

Let the acceleration of the body = a.

Using Third equation of motion,

v² = u² - 2aS

0² = (25)² - (2 × a × 1.5)

0 = 625 - 3a

3a = 625

a = 625/3

a = 208.3 ms-²

Hence,

The Acceleration of the body = a = 208.3 ms-²