college physics

A truck of mass 9M is moving at a speed v = 15 km/h when it collides head on with a parked car of mass M. Spring mounted bumpers ensure that the collision is essentially elastic. Find the final velocities of each vehicle. Repeat for the case of the car moving at speed v= 15 km/h and colliding with the stationary truck. What fraction of the incident vehicle’s kinetic energy is transferred in each case?

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