Directions : These questions consist of two statements each printed as Assertion and Reason. While answering these questions you are required to choose any one of the following four responses
Assertion: One end of a massless rod of length l is hinged, so that it is free to rotate in a 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 $\sqrt{5 g l}$ to
complete the circular motion.
Reason : Work done by centripetal force on the particle is always zero.

Question

Directions : These questions consist of two statements each printed as Assertion and Reason. While answering these questions you are required to choose any one of the following four responses

Assertion: One end of a massless rod of length l is hinged, so that it is free to rotate in a 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 $\sqrt{5 g l}$ to
complete the circular motion.
Reason : Work done by centripetal force on the particle is always zero.

Infinity Learn · Accepted Answer

In case of massless rod, minimum speed at lower most  position of the particle is  $$5gl$$  to complete the circular motion.Work done by centripetal force on the particle is always zero.

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