A Pair of Identical Balls Is Connected by a Massless

A pair of identical balls is connected by a massless rod,and thrown up into the air.The velocity of the center of mass is initially 17.2 m/s upward.1.0 s later,one of the balls is measured to be at rest.What is the velocity of the other ball at this time? Ignore air resistance.

A) 14.8 m/s up
B) 9.8 m/s down
C) 7.4 m/s up
D) 7.4 m/s down

Correct Answer:

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