A porter is moving on a platform with a box of 10 kg on his head. In moving 20 m, work done by the force of gravity will be (g = 10 m/sec2) :

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A porter is moving on a platform with a box of 10 kg on his head. In moving 20 m, work done by the force of gravity will be (g = 10 m/sec²) :

2000 J

zero

1000 J

500 J

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In this question force of gravity and displacement of porter is in perpendicular direction.

$∴$ W = F.Scosq = F.S.cos90º = 0

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