Question

5. A bullet initially moving with a velocity 20 m l
strikes a target and comes to rest after penetrating a
distance 10 cm in the target. Calculate the retardation
caused by the target.
Ans. 2000 m 2
1
.
​

Answer 1

Calculate the retardation caused by the target. ... velocity, u = 20 m/s ; Final velocity, v = 0 m/s and s = 10 cm = 0.1 m ... Thus, the retardation of the bullet is 2000 ...

Answer 2

according to question

u = 20m/s

s = 10cm = 0.1

v = 0

using v² = u² + 2as

a = - u²/2s

= 400l0.2 = -2000m/s²

retardation = -a = 2000m/s²