A mass of 1 kg is kept on a inclined plane with 30° inclination with respect to horizontal plane and it is at rest initially. Then the whole assembly…

A mass of $\displaystyle 1$ kg is kept on a inclined plane with $\displaystyle 30$° inclination with respect to horizontal plane and it is at rest initially. Then the whole assembly is moved up with constant velocity of $\displaystyle 4 \mathrm{~m} / \mathrm{s}$. The work done by the frictional force in time $\displaystyle 2$ s is $\displaystyle \_\_\_\_$J. (Take $\displaystyle \mathrm{g}=10 \mathrm{~m} / \mathrm{s}^2$ )