Question

A bullet hits a wall with a valocity of 20m/s and patrates it up to a distence of 5m.find the decaleration of the bullet in the wall.

Answer 1

Final velocity =0
initial velocity=20m/S
distance =5m
then using third equation of motion
$- {u}^{2} = 2 \times a \times s \\ - 400 = 2 \times a \times 5 \\ a = - 40$