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Theoretical Verification of Law of Conservation

When a player...

Question

When a player hits a football, it moves along the curved path and then falls to the ground .What is work done by the force of gravity on the football?

A

Positive.

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B

Negative.

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C

Zero.

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D

Undefined.

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Solution

The correct option is B Zero.
Work done by the gravity on the foot ball is zero as the gravity is acting downwards but the displacement is in the perpendicular direction.
we know $W = F . D . c o s θ; θ = 90^{0}$
so hence,work done $W = 0$

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