Verified Solution • 2025–26 Session
moderate
QNEET-2018-Ph-918: NEET 2018 Physics - Class 11 NEET-2018-Ph-918 Solution: A body initially at rest and sliding along a frictionless track …
A body initially at rest and sliding along a frictionless track from a height h (as shown in the figure) just completes a vertical circle of diameter AB = D. The height h is equal to D 3D/2 7D/5 5D/4
Multiple Choice Options
- A D
- B 2 3 _ D
- C 5 7 _ D
- D 4 5 _ D
Step-by-Step Verified Solution
Since from the given figure, in order to complete
the vertical circle, velocity at the bottom of vertical
circle should be 5 g R .
As body is at rest initially, i.e., speed = 0.
At point A, speed = v.
As track is frictionless, so total mechanical energy
will remain constant.
_ 0 + mgh = 1 2 m v 2 + 0
_ h = v 2 2 g
For completing the vertical circle, v � 5 g R
_ h = 5 g R 2 g = 5 2 R = 5 4 D