A 0.140kg baseball is traveling at 42 m/s. A batter hits theball with a net force of 1420 N, opposite to the direction of theball's initial motion. The bat and ball are in contact for7.5*10^-3 seconds.
a) what is the mgnitude of the change in momentum of thebaseball?
b) what is the final velocity of the baseball?
I'm completely lost on this whole question. Any help would begreat.