The mass of the bob of a simple pendulum is $m$ and it can be raised maximum up to height $h$ . The work done by gravity in moving it from one extreme to another, is-

2mgh

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mgh

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zero

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Solution

The correct option is D zero
Since displacement in the direction of force is zero hence W.D will be zero.
Alternatively, work done is equal to sum of change in PE and KE.
At the extreme points PEs are equal and KE is zero.
Hence, since there is no change in energy, work done is zero.

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The mass of the bob of a simple pendulum is m and it can be raised maximum up to height h. The work done by gravity in moving it from one extreme to another, is-

The correct option is D zeroSince displacement in the direction of force is zero hence W.D will be zero.Alternatively, work done is equal to sum of change in PE and KE.At the extreme points PEs are equal and KE is zero.Hence, since there is no change in energy, work done is zero.

The mass of the bob of a simple pendulum is $m$ and it can be raised maximum up to height $h$ . The work done by gravity in moving it from one extreme to another, is-

The correct option is D zero
Since displacement in the direction of force is zero hence W.D will be zero.
Alternatively, work done is equal to sum of change in PE and KE.
At the extreme points PEs are equal and KE is zero.
Hence, since there is no change in energy, work done is zero.