A 50-Kg Block Slides a Distance of 4 $\theta$ = 30 ^$\circ$

A 5.0-kg block slides a distance of 4.0 m down a rough inclined plane.The inclined plane makes an angle $\theta$ = 30 ^$\circ$ with respect to the horizontal.If the block had an initial velocity of 2.0 m/s down the inclined plane and a final velocity of 6.0 m/s down the inclined plane,how much energy was lost by the block due to the work done by friction?

A) 88 J
B) 28 J
C) 80 J
D) 8.0 J
E) 18 J