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On a cold winter day, a penny (mass 2.50 g) and a nickel (mass 5.00 g) are lying on the smooth (frictionless) surface of a frozen lake. With your finger, you flick the penny toward the nickel with a speed of 2.25 m/s . The coins collide elastically; calculate both their final speeds.What are the directions of their final velocities, opposite or the same?

Answer :

Lizzy190
 cannot be done because they can deflect in various direction 
momentum is conserved. energy is changed to heat and sound "click" 
you could solve it it they were stuck in a straight line track 
no real collision is perfectly elastic 

did the penny go 2.25 hundred million miles and hour? pretty strong finger 
all problems need units

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