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In: Physics

a 4.2 g coin sliding to the right at 21.4 cm/s makes an elastic head-on collision...

a 4.2 g coin sliding to the right at 21.4 cm/s makes an elastic head-on collision with a 12.6g coin that is initially at rest. after the collision, the 4.2g coin moves to the left at 10.7cm/s.
a. find the final velocity of the other coin in cm/s
b. find the amount of kinetic energy transferred to the 12.6g coin

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