Question

A block of mass m is sliding down an inclined plane with constant speed. At a certain instant $t_0$ , its height above the ground is $h$ and coefficient of kinetic friction between the block and the inclined plane is $\mu$. If the block reaches the ground at a later instant $t_g$ , then the energy dissipated by friction in the time interval $(t_g-t_0)$ is :

• A. $\mu mgh$
• B. $mgh$
• C. $\mu mgh/\sin \theta$
• D. $\mu mgh/\cos \theta$

Answer 1

The correct option is B $mgh$