A metre scale is moving with uniform velocity. This implies .

Options

A. the force acting on the scale is zero but, a torque about the 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.
D. neiter the force not the torque need to be zero.

Answer

B

Explanation

To solve this question we have to apply Newton's second law of motion in temrs of force and change in momentum.
We known that `F =(dp)/(dt)`
given that meter scale is moving with uniform velocity hence `dp =0` Force `=F =0` As all part of the scale is moving with uniform velocity and total force is zero hencem, torque will also be zero .