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The gravitational potential difference between the surface of a planet and a point `20 m` above it is `16 J//kg`. Calculate the work done in moving a `4 kg` body by `8m` on a slope of `60^@` from the horizontal.

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The vertical height through which the body has to be raised `=8sin 60^(@)=4sqrt(3)m`. The `P.D.` for a distance of `20 m` is `16 J//kg`. Hence, the `P.D.` for a distance of `4sqrt(3)m` for a mass of `2kg` is `(4sqrt(3))/20xx16xx2~~11 J`

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