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Potential Energy of an Object at a Height

A body of 10 ...

Question

A body of 10kg is kept on a table. If it is displaced by a force of 10N by 2m in horizontal line. Find work done by gravitational force.

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Solution

Since gravitational force is perpendicular to the displacement of the object. θ = 90^o

Work done = Force * Displacement * Cosθ

Work done by gravitational force = 100 * 2 * Cos 90^o

= 0

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