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A 20. kg object sitting at rest is struck elastically in a head on collision with...

A 20. kg object sitting at rest is struck elastically in a head on collision with a 10. kg object initially moving at +3.0 m/s. Find the final velocity of 20 kg object after the collision
a. +3.5
b. + 2.0
c. + 0.50
d. - 1.0
e. -2.0

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