a volleyball spiked so that its incoming velocity of +4.0m/sis changed to an outgoing velocity of -21m/s. The mass of thevolleyball is 0.35 kg.
a) what is the change in velocity?
b) what is the change in momentum of the ball?
c) what impulse does the player apply to the ball?
d) if the contact time of the spike is 0.1 seconds,what is the force applied on the ball by the player's hand?