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Two heavy spheres each of mass 100kg and...

Two heavy spheres each of mass `100kg` and radius `0.1m` are placed `1m` apart on a horizontal table. What is the gravitationl field and potential at the mid point of the line joining their centres. The gravitational potential difference between the surface of a planet and a point `20m` above it is `16J//kg`. Calculate the workdone in moving a `2kg` mass by `8m` on a slope of `60^@` from the horizontal.

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