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A mass hangs on a string fixed at point ...

A mass hangs on a string fixed at point P . It starts from position 1 and swings tot he farthest position on the opposite side, position 2. It then oscillates several times with decreasing amplitude before ending at position 3
Where does the ball have the maximum kinetic energy ?

A

At position 1

B

At position 2

C

The first time at position 3

D

The last time at position 3

Text Solution

Verified by Experts

The correct Answer is:
C
When the mass is at position 1, it has gravitational potential energy. After it swings and reaches position 3, its gravitational potential energy is transformed into kinetic energy . When it reaches position 3, its gravitational potential energy is transformed into kinetic energy. When it reaches position 2, its kinetic energy is transformed back into gravitational potential energy . When the mass continues to swing, some of its total energy is transformed into thermal energy and lost tot he surrounding. Hence the mass has the maximum kinetic energy at its first tie at position 3
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