Question

What is the work done by the force of gravity in the following cases:-
1) Satellite moving around the earth in the circular orbit of radius 35000 km.
2) A stone of mass 250 g is thrown up a height of 2.5 m.

Answer 1

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Answer 2

The work done by the force of gravity in the following cases:

Explanation:

• case 1: work done will be 0, as the displacement here is occurring in perpendicular direction to the force applied i.e. gravity.
• case 2: As the stone comes back to the earth, the displacement is 0. so the net work done by gravitational force will be 0. in moving the stone up the work done will be exactly the same and opposite while  the stones coming  down.