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so lets use this example, bumper car A has a mass of 200kg and travels at 5ms-1 east while bumper car b weighing 150kg travels 5ms-1 West. if this is a elastic collision , would the bumper cars rebound back at the same speed?

Hi, i i have a few questions on momentum and collisions. 1)in a inelastic collision are both objects moving or can 1 be stationary. 2) In a elastic collision why is kinecetic energy conserved? 3) if kinectic energy is conserved in a elastic collision does it mean that it travels with the same velocity it had prior to the collision? And lucky last, a collision invovling dogems or bumper cars whould be what type of collision. Thanks,