9)Bumpy is on a sled of mass 3500 kg moving at 32 m/s. Lumpy is on a sled of mass 4100 kg moving at 10 m/s. They collide with each other, with the collision softened by a spring of force constant 7.1 MN/m. What is the maximum compression of the spring?

6) Xerxes is driving a 2200 kg car and rams into Phiilip who was stopped in his 1500 kg car. She was travelling at 36 km/h before the collision and is moving at 18 km/h afterward. All the lost kinetic energy goes into crushing P's car. It takes 50000 N to crush the car. How much shorter has the car become?