The motion of planets in the solar system is an example of conservation of
a)	Mass	b)	Momentum	c)	Angular momentum	d)	Kinetic energy

(c)

From Kepler’s second law of motion, a line joining any planet to the sun sweeps out equal areas in equal intervals of time. Let any instant , the planet is in position . Then area swept out by  is

The instantaneous areal speed is

Let  be angular momentum,  the moment of inertia and  the mass, then

constant

Hence, angular momentum of the planet is conserved.