Question

Assertion: For looping a vertical loop of radius `r`, the minimum velocity at lowest point should be `sqrt(5gr)`.
Reason: In this event, the velocity at the highest point will be zero.

Options:
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false and R is also false.