Problem 4. A truck with a mass of 5000 kg has a speed of 30 m/s at the bottom of a hill. (a) If the driver lets the truck coast

up the hill, at what height H will the truck come to a complete stop?Ignore friction. (Note that it actually requires static friction for the wheels to roll smoothly but that does not remove mechanical energy from the system.) (b) At what height H will the kinetic energy of the truck be 562500 J?