1. The problem statement, all variables and given/known data Hail stones of mass 0.0650 kg are falling straight down with a speed of 15 m/s when they strike a car roof. If the hailstones bounce to a height of 12 cm above the car, what is the impulse that the car roof imparts to a single hailstone? 2. Relevant equations p=mv J=Ft 3. The attempt at a solution I tried finding the downward momentum first and then equalling it to the upward momentum of the hailstones but I am stuck on where to plug in the height of the bounce. Do I need to find velocity or time of the hailstone on the way up first? If I found time I think I could multiply it by Force to get J (Impulse).