Question

A 1.2-kg object moving with a speed of 8.0 m/s collides perpendicularly with a wall and emerges with a speed of 6.0 m/s in the opposite direction. if the object is in contact with the wall for 2.0 ms, what is the magnitude of the average force on the object by the wall? ans: 8400 n

Answer 1

Newton's second law applies. That is,

F=ma, F = Wall force on the object, m = mass of the object, a = Deceleration = Δv/t = (6-8)/2 = -1 m/s

F = 1.2*1 = 1.2 N