A 4.00 kg object is moving at 5.00 m/s EAST.It strikes a 5.00 kg that is moving WEST at 2.00 m/s.The objects have a one-dimensional elastic collision in the EAST-WEST direction.The velocity of the 5.00 kg object after the collision is
A) 4.22 m/s EAST.
B) 2.78 m/s WEST.
C) 4.22 m/s WEST.
D) 2.78 m/s EAST.
E) 1.11 m/s WEST.

Question

Quizplus · Accepted Answer

Explanation:Momentum before collision = (4.00 kg)(5.00 m/s) + (5.00 kg)(-2.00 m/s) = 10.00 kg m/s EASTMomentum after collision = (4.00 kg)v1 + (5.00 kg)v2 = 10.00 kg m/s EASTSolving for v2: v2 = 4.22 m/s EAST

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