The orbit of Pluto is much more eccentric than the orbits of the other planets. That is, instead of being nearly circular, the orbit is noticeably elliptical. The point in the orbit nearest to the Sun is called the perihelion and the point farthest from the Sun is called the aphelion.

As Pluto moves from the perihelion to the aphelion, the work done by gravitational pull of Sun on Pluto is

Options

A. is zero
B. is positive
C. is negative
D. depends on sence of rotation

Answer

C

Explanation

As Pluto moves away, the diaplacement has component opposite to the air force, hence work done is negative.