momentum and impulse?

Question

A ball of mass .150 kg is dropped from rest at a height of 1.25m. It rebounds from the floor to reacha height of .960 m. What impulse was given to the ball by the floor?

Answer 1

Isn't the impulse just the change in momentum?

If so, you just need to solve for the velocity before and after it hit the floor. Since the ball completely changed direction, you just add the two numbers together. Multiply by the mass to get the change in momentum.