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?

Question

Mckinley Clark

Physics

12 November, 17:11

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?

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Kamryn Dillon · Answer 1

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