Why it is difficult to measure impulsive force?

A volleyball player starts a serve by throwing the ball vertically upward. The 240g volleyball comes to rest at its maximum height. The server then hits it and exerts an average horizontal force of magnitude 6.2 N on the ball. Determine the speed of the ball after the player hits it if the average force is exerted on the ball for 600 ms.

An outfielder throws a 0.148 kg baseball with velocity 30 m/s at 25° above horizontal. Ignoring air resistance: what KE did the ball have, at its peak (highest point)?

with what force will 1055 kg car that is accelerating at 2.44 m/s/s hit a tree?

You are playing volleyball. Your hand was in contact with the ball for 3milliseconds during the rally. The 1000gram ball leaves your hand with a speed 2.4m/s. Calculate the average force of you exerted on the volleyball.