Question

. If we drop a body of mass m from a height h, to the surface of earth, its speed will increase as it

comes nearer to the surface of earth. The force on the body is equal to the product of mass and

acceleration. For a freely falling body, acceleration a is equal to the acceleration due to gravity g.

Acceleration due to gravity on the surface is given by g=GM / R2

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Answer 1

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In each of these examples the acceleration was the result of gravity. Your object was accelerating because gravity was pulling it down. Even the object tossed straight up is falling — and it begins falling the minute it leaves your hand. If it wasn't, it would have continued moving away from you in a straight line. This is the acceleration due to gravity.