In the arrangements shown in figure, the...

In the arrangements shown in figure, the pulleys are all massless. The load has a mass of 21 kg. the point P is moved by a distance of 2.5 cm. find the minimum work (in J) required to be done by the force.

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The correct Answer is:

`4T+2T+T=21 g `
T=30
F=8T=240
`W=FS =240 xx2.5/100=6J`

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