Two balls with masses of 2.50 kg and 6.20 kg travel toward each other at speeds of 10.0 m/s and 4.20 m/s, respectively. If the balls have a head-oninelastic collision and the 2.50-kilogram ball recoils with a speed of 8.40 m/s, how much kinetic energy is lost in the collision?

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!