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Assertion One end of a massless rod of l...

Assertion One end of a massless rod of length l is hinged so that it is free to rotate in vertical plane about a horizontal axis. If a particle is attached to the other end of the rod, then the minimum speed at lower most position of the particle is `sqrt(5gl)` to complete the circular motion.
Reason Work done by cnetripetal force on the particle is always zero.

A

If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

B

If both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.

C

If Assertion is true but Reason is false.

D

If Assertion is false but Reason is true.

Text Solution

Verified by Experts

The correct Answer is:
D
In case of massless rod, `v_("min")=sqrt(4gl)`.
Work done by centripetal force on the particle is always zero.
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