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A bob of mass m, suspended by a string o...

A bob of mass m, suspended by a string of length `l_1` is given a minimum velocity required to complete a full circle in the vertical plane. At the highest point, it collides elastically with another bob of mass m suspended by a string of length `l_2` which is initially at rest. Both the strings are massless and inextensible. If the second bob, after collision acquires the minimum speed required to complete a full circle in the vertical plane, the ratio `l_1//l_2`, is

A

2

B

3

C

5

D

7

Text Solution

Verified by Experts

The correct Answer is:
C
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