there's a couple of problems that i have to give in at the end of this lunctime that i just cant work out how to approach or what formulas to use: 1. A 70g tennis ball falls 2 meters and bounces back up to a height of 1.9 meters (a)How much kinetic energy does the tennis ball have? (b)the ball compresses 10cm for a period of 2 seconds, what is the kinetic energy of the ball during this time? 2) a car is travelling at 75km/h up a hill. Assuming that gravity =9.8 ms-2, what is the maximum height that the car wil reach?