Question

Assertion (A): the field within which the earth can exert its force of gravity on any object of mass

m is called gravitational field its expression is E=GM/r 2

Reason(R): the strength of gravitational field decreases as we move away from the earth​

Answer 1

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If an object is lifted, work is done against the force of gravity. When work is done energy is transferred to the object and it gains gravitational potential energy. If the object falls from that height, the same amount of work would have to be done by the force of gravity to bring it back to the Earth's surface.