Question

A bullet of ,mass 50g strikes a plank of thickness 5cm with a velocity of 100m/s and emerges out with a velocity of 50m/s. calculate the retarding force on the bullet

Answer 1

m=50g
S=5cm=5/100kg
v=50m/s
u=100m/s
v^2-u^2=2as
2500-10000=2×a×5/100
a=-7500m/s^2
F=m×a
=3750 N