A 30-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 the 30 kg object after the collision
a. -1.0 m/s
c. +1.5 m/s
b. +1.2 m/s
d. +2.0 m/s
C
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