Published by:
CGP EDU Academic Team
Published on: August 21, 2026
The bob 
of simple pendulum is released, then the string makes an angle of 
with the vertical. It hits another bob 
of the same material and same mass kept at rest on the table. If the collision is elastic, then
A
Both 
and 
rise of the same height.
and rise of the same height.
B
Both 
and 
come to rest at 
.
and come to rest at .
C
Both 
and 
move with the same velocity of 
.
and move with the same velocity of .
D
comes to rest and 
moves with the velocity of 
.
Text Solution
Verified by ExpertsThe correct answer is:
As bob 
is of same material and same mass as that of bob 
, therefore on elastic collision, their velocities are exchanged.
By momentum conservation and 
, we have
Using Eqs. (i) and (ii), we get
Bob 
comes to rest and 
moves with the velocity of 
.
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