A man weighing $50 kg$ is walking on a horizontal surface (assumed smooth) for a distance of $1 km$ . What is the work done by his weight?

Zero

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Positive

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Negative

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Nothing can be said

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Solution

The correct option is A Zero
The displacement and force of gravity are perpendicular to each other, so work done by his weight is zero.

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A man weighing 50 kg is walking on a horizontal surface (assumed smooth) for a distance of 1 km. What is the work done by his weight?

The correct option is A ZeroThe displacement and force of gravity are perpendicular to each other, so work done by his weight is zero.

A man weighing $50 kg$ is walking on a horizontal surface (assumed smooth) for a distance of $1 km$ . What is the work done by his weight?

The correct option is A Zero
The displacement and force of gravity are perpendicular to each other, so work done by his weight is zero.