Assertion: If a body is momentarily at rest, it means that force or acceleration are necessarily zero at that instant.
Reason : Force on a body at a given time is determined by the direction of motion only.

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both assertion and reason are false.

both assertion and reason are true but reason is not the correct explanation of assertion.

assertion is true but reason is false.

both assertion and reason are true and reason is the correct explanation of assertion.

answer is D.

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Detailed Solution

If a body is momentarily at rest i.e., $v = 0$ at an instant, it does not mean that force or acceleration are necessarily zero at that instant. For example, when a ball thrown upward reaches its maximum height, $v = A$ but the force continues to be its weight $m g$ and the acceleration is $g$ . Force is not always in the direction of motion.

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