can you help with this question?

A solid rubber ball is dropped and takes 0.78206 second to hit the concrete floor below. The ball then bounces straight up to a height of 2.755 m. The mass of the ball is 100.00 g. a) What is the magnitude of the velocity of the ball just before it hit the floor? [1 Mark] b) What was the potential energy of the ball just before it was dropped? [2 Mark] c) What was the momentum of the ball just before it hit the concrete floor? [1 Mark] d) What was the velocity of the ball just after it bounced off the concrete floor? [2 Marks] e) What was the impulse delivered to the ball just after it bounced off the concrete floor? [2