The roof of a tall building is 25m above the ground.it strikes the concrete floor on the ground with velocityV1.it bounces to a maximum height of 6m.the ball was in contact with the floor for 0.9s.wht is the velocity of v1 when the ball hits the floor? And what was the impulse of the ball as a result of the collission and also what was the magnitude of the net force exerted on the ball?
