Select the cases in which work done is not zero.

A bird flying

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A kid standing at a bus stop

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A man pushing a wheelchair

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A bike at a parking spot

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Solution

The correct options are
A A bird flying
C A man pushing a wheelchair
Work is said to be done by an object, when the force applied by/on the object results in some non zero displacement (movement).
When a bird flies, it flaps (force) its wings in order to move forward in the air. So, some work is done by the bird. Also when a man pushes a wheelchair, he applies some force on it which causes the wheelchair to move. So, some work done by the man.
Whereas with a kid standing at a bus stop, there is no movement, so no work is done by the kid. Also, when a bike is at rest in a parking lot, the work done by it is zero.

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