A $4.00 \mathrm{~kg}$ object is moving at $5.00 \mathrm{~m} / \mathrm{s}$ EAST. It strikes a $6.00 \mathrm{~kg}$ object that is at rest. The objects collide elastically. The velocity of $4.00 \mathrm{~kg}$ object after the collision is in the SOUTHWEST direction. The speed of the $6.00 \mathrm{~kg}$ object after the collision is
A) $3.02 \mathrm{~m} / \mathrm{s}$.
B) $3.96 \mathrm{~m} / \mathrm{s}$.
C) $2.38 \mathrm{~m} / \mathrm{s}$.
D) $4.06 \mathrm{~m} / \mathrm{s}$.
E) $5.22 \mathrm{~m} / \mathrm{s}$.

Question

Quizplus · Accepted Answer

In an elastic collision, both momentum and kinetic energy are conserved. Using these principles, the speed of the $6.00 \mathrm{~kg}$ object after the collision can be calculated to be $3.96 \mathrm{~m} / \mathrm{s}$.

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A $4.00 \mathrm{~kg}$ Object Is Moving At $5.00 \mathrm{~m} / \mathrm{s}$ EAST It Strikes A Is