Question

(ii) A body rotating about an axis has an angular momentum L. If a constant
torque acting on the body doubles its angular momentum, the direction of
the torque is the same as that of
(a) its angular velocity
(b) its linear velocity
(c) its centripetal acceleration
(d) the position vector of its centre of mass.​

Answer 1

Answer:

option (a)

Explanation:

Total angular momentum of a rotating body remains constant, if the net torque acting on the body is. Angular momentum is conserved i. e L1=L2.

Answer 2

a.  angular velocity

• If the net torque operating on the body is constant, the total angular momentum of the rotating body remains constant. The conservation of angular momentum is observed.
• The angular momentum of a situation is assumed to be constant. The torque would be zero in this circumstance. 
• Acceleration and angular acceleration remain zero if the body's velocity and angular velocity, whether zero or non-zero, stay unchanged across time.
• If the acceleration is zero in rectilinear motion, Newton's second law states that the resultant force is also zero.