Answer:
(a) Work done is zero, as shown in the figure below,
When electron revolves around the nucleus, a
centripetal force Facts along the radius towards the centre
O. The displacement (s) acts tangentially therefore, the angle between the
force and the displacement is 90°. Therefore,
W = Fs cos 90° = 0 []
(b)W =mgh
As the stone is dropped, its PE starts to convert into KE.
Let its speed is v, then from v2 = 2gh (when stone reaches the
ground)
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