A particle performs uniform circular motion with an angular momentum . If the frequency of particle’s motion is doubled and its KE is halved, the angular momentum becomes
a)		b)		c)		d)

(d)

The angular momentum is measure for the amount of torque that has been applied over time the object. For a particle with a fixed mass that is rotating about a fixed symmetry axis, the angular momentum is expressed as

                                                                  …(i)

Where  is moment of inertia of particle and  the angular velocity.

Also,                                                                    …(ii)

Where  is kinetic energy of rotation.

From Eqs. (i) and (ii), we get

Note   In a closed system angular momentum is constant.