Rotational Motion Question 89

Question: A body initially at rest and sliding along a frictionless track from a height h just completes a vertical circle of diameter AB=D . The height h is equal to

Options:

A) 75D

B) D

C) 32D

D) 54D

Show Answer

Answer:

Correct Answer: D

Solution:

  • [d]

    As track is frictionless, so total mechanical energy will remain constant

    T.M.El=T.M.EF

    0+mgh=12mvL2+0

    h=vL22g

    For completing the vertical circle, vL5gR

    h=5gR2g=52R=54D



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