Question

a bullet of mass 50 gm strikes a target and comes to rest after penetrating a distance of 20 cm in the target. if the initial velocity of the buttet is 250 m/s, calculate the retardation caused by the target

Answer 1

we know that

v² - u² =2as

where

v = 0

u = 250 m/s

s = 20 cm = 0.2 m

or by rearranging, we get

a = (v² - u²) / 2s

or

a = (0 - 250²) / (2 x 0.2)

thus, the retardation caused will be

a = -62500 / 0.4

or

a = -156250 m/s²