What is the amount of work done in the following cases?Justify your answer by giving appropiate reason

a) by an electron revolving in a circular orbit of radiusr around a nucleus.

b) By the force of gravity when a stone of mass m is dropped from the top of a multi storeyed building of height h

(a) Work done by electron in a complete rotation is zero because displacement of electron is zero.

(b) Work done by the force of gravity = force * displacement in the direction of force

 = mg *h


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in a the work is 0 beacause there is no displacemet

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No in "a" it is zero because the force of attraction acts perpendicular to the displacement.

in "b"....i dont know

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