Question

A bullet traveling at 200 m/s strikes a soft wood and penetrates 4.5 cm through it before coming to rest. Calculate the bullet's average retardation

Answer 1

V^2 = Vo^2 + 2a*d.
V = 0, Vo = 200 m/s, d = 0.045 m., a = ?.

Answer 2

-4.44*10^5m/s^2

Answer 3

-4.44m/s2