Question

Work done by force of gravity of earth on moon is-
a) positive
b) negative
c) zero
d) none of these​

Answer 1

Answer:

c) Zero

Explanation:

At first glance this answer will sound ridiculous. But the moon's displacement always stays in 90 degree with earth. Hence it's force is Zero. In other words Force and displacement are perpendicular.

Hope it Helps.