question_answer 42)

                  A metre scale is moving with uniform velocity. This implies                 (a) the force acting on the scale is zero, but a torque about die centre of mass can act on the scale.                 (b) the force acting on the scale is zero and the torque acting about centre of mass of the scale is also zero.                 (c) the total force acting on it need not be zero but the torque on it is zero                 (a) neither the force nor the torque need to be zero.

Answer:

                  (b) Metre scale moving with uniform velocity is in translational as well as in rotational equilibrium because net force acting on the rod as well as net torque acting on the rod is zero.