The bob A of a pendulum of mass m released from horizontal to the vertical hits another bob B of the same mass at rest on a table as shown in figure. If the length of the pendulum is 1 m, what is the speed with which bob B starts moving:
(Neglect the size of the bobs and assume the collision to be elastic) (Take 
)
Text Solution
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: As the collision is elastic and two balls have the same mass, therefore ball A transfers its entire momentum to the ball B and ball A does not rise at all. After collision ball A comes to rest and ball B moves with speed of ball A.
The speed with which bob B starts moving is
=4.47 m s -1
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