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Doubt & Answer Explanation

Doubt

the gravitational potential difference between the surface of a planet and a point 20m above it is 16J/Kg.Then the work done in moving a 2Kg mass by 8m on a slope 60* from the hrizontal is????

Answer Explanation

Work done = mgh= mg(8sin60⁰) where, 8sin60⁰is the vertical height to be travelled by the body.

The value of g will be Gm/r² = (Gm/r) X 1/r = gravitational potential/r = 16/20 ms^-2. = 0.8 ms^-2.

W = 2 X 0.8 X 8 X (3)^1/2/2 (sin60⁰= (3)^1/2/2 )

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