Aboulder that is resting on the top of a cliff slips over the edge and accelerates towards the ground. as the rock falls, the amount of kinetic energy
a) increases.
b) decreases.
c) stays the same.
d) increases then decreases.

Estimate the kinetic energy of the neptune with respect to the sun as the sum of the terms, that due to its daily rotation about its axis, and that due to its yearly revolution about the sun. [assume the neptune is a uniform sphere with mass = 1.0×1026 kg , radius = 2.5×1010 m , rotation period 16.1 h , orbital period 6.01×104 d and is 4.6×109 km from the sun.]