555. 666. The bumper of a 2000 kg car has a spring constant of 5 x 106 N/m. The car is moving at 4.5 m/s horizontally when it crashes into a solid brick wall. How much will the car's bumper be compressed if the car comes to a complete stop? A 1.2 kg spring laboratory cart is held against a wall. The spring constant is 65.0 N/m. The spring is compressed 8.0 cm when held against the wall. What is the compression of the spring when the cart's velocity is 42.0 cm/s? A 500 g hockey puck is travelling head-on at 33.0 m/s toward a goalie's pads. The goalie, initially at rest and completely padded, has a mass of 75.0 kg. The puck causes the goalie's pad to be compressed by 3.00 cm and pushes her backward at 0.300 m/s. Calculate the momentum and kinetic energy of the puck and the goalie before collision. Calculate the velocity of the puck after collision. Calculate the kinetic energy ofthe puck and the goalie after collision. Is this collision elastic or inelastic? Explain. An elastic collision occurs between a 10 g marble and a 50 g marble. The smaller marble is travelling north at 5.0 m/s in a head-on collision course with the other marble, initially at rest. Determine the final velocities of both marbles