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

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

Gravitation

Solution:

As gravity is an attractive force and acts towards the centre of sun.Now taking Pluto from the perihelion to the aphelion means it is moving away from Sun,thus from $W =\overrightarrow{ f . \overrightarrow{ s }}$ implies that work done by gravitational force has to be negative.