A boy throws a rubber ball vertically upwards. What kind of work is done by the gravitational force.

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Solution

When a boy throws a ball vertically upward then the direction of the displacement of the ball is opposite to the direction of the gravitational force by the Earth
Because the direction of the gravitational force is towards the center of the earth( in a downwards direction).
So, when force and displacement are in opposite directions, work will be negative.
So, the work done by the gravitational force of the Earth is negative.

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