A Man moves on a straight horizontal road with a block of 2kg in his hand. If he covers a distance of 20m with constant velocity of 1m/s. Find work done by man on block during motion.

400J

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40J

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zero

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Solution

The correct option is C
zero

man applies force on block in upwards direction and the movement of block is 40 mts perpendicular to the force applied by man. Thus work done by man is zero.

(The force that actually let the block move forward is friction between Palm and block)

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A Man moves on a straight horizontal road with a block of 2kg in his hand. If he covers a distance of 20m with constant velocity of 1m/s. Find work done by man on block during motion.

The correct option is C zero man applies force on block in upwards direction and the movement of block is 40 mts perpendicular to the force applied by man. Thus work done by man is zero. (The force that actually let the block move forward is friction between Palm and block)

The correct option is C
zero

man applies force on block in upwards direction and the movement of block is 40 mts perpendicular to the force applied by man. Thus work done by man is zero.

(The force that actually let the block move forward is friction between Palm and block)