Minimum Height for a Vertical Loop
A block is released from rest at height h and slides along a frictionless track that forms a vertical loop of radius R. What is the minimum value of h, in terms of R, that allows the block to complete the loop without losing contact with the track?
A
h = 3R
B
h = 2R
C
h = 5R/2
D
h = 2.5R
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