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OpenStudy (anonymous):

Two masses, each weighing 1.0 × 103 kilograms and moving with the same speed of 12.5 meters/second, are approaching each other. They have a head-on collision and bounce off away from each other. Assuming this is a perfectly elastic collision, what will be the approximate kinetic energy of the system after the collision?

OpenStudy (mani_jha):

In an elastic collision, is the kinetic energy after collision same as the kinetic energy before collision?

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