A 4.00 kg object is moving at 3.00 m/s WEST. It catches up to and strikes a 6.00 kg that is moving WEST at 2.00 m/s. The objects undergo an elastic collision in the EAST-WEST direction. The velocity of the 4.00 kg object after the collision is
A) 1.00 m/s WEST.
B) 2.80 m/s EAST.
C) 1.80 m/s WEST.
D) 2.80 m/s WEST.
E) 1.80 m/s EAST.

Question

Quizplus · Accepted Answer

In an elastic collision, both momentum and kinetic energy are conserved. Using these conservation laws, the velocity of the 4.00 kg object after the collision is calculated to be 1.80 m/s WEST.

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