A block of mass $\mathrm{m}$ is sliding down an inclined plane with constant speed. At a certain instant $\mathrm{t}_{0}$, its height above the ground is $\mathrm{h}$. The coefficient of kinetic friction between the block and the plane is $\mu$. If the block reaches the ground at a later instant $\mathrm{t}_{\mathrm{g}}$, then the energy dissipated by friction in the time interval $\left(\mathrm{t}_{\mathrm{g}}-\mathrm{t}_{0}\right)$ is-

• A

  $\mu \mathrm{mgh}$
• B

  $\mu \mathrm{mgh} / \sin \theta$
• Correct answer
  C

  $\mathrm{mgh}$ )
• D

  $\mu \mathrm{mgh} / \cos \theta$

Hence, the correct answer is option: 'C'.