I have a ball that is dropped from from rest at a height of 1.2 meters it hits the ground and bounces to a height of 0.7 meters. The mass of the ball is 0.5kg. I am assuming that initial velocity is 0 because it is released from rest. I need to find the magnitude of direction of the impulse of the net force. I know that the direction will be in the upward direction. But how do I find Impulse. I have Impulse (J)=average forse X the change in time. net force= (MVfinal-MVinitial)/change in time. ? Were can I go from here? Any help would be great thanks.