a bullet initially moving with a velocity 20m s strikes a target and comes to rest after penetrating a distance 10 cm in the target calculate the retardation caused by the target
Here,
Initial velocity, u = 20 m/s
Final velocity, v = 0
Distance travelled, s = 10 cm = 0.1 m
Now, using,
v2 = u2 + 2as
=> 0 = 202 + (2)(a)(0.1)
=> a = -2000 m/s2
This is the acceleration of the bullet. So, the retardation is = 2000 m/s2