A block of mass 1 kg slides down on a rough inclined plane of inclination `60^(@)` starting from its top. If the coefficient of kinetic friction is 0.5 and length of the plane is 1 m , then work done against friction is (Take `g=9.8m//s^(2)`)
A. 9.82 J
B. 4.94 J
C. 2.45 J
D. 1.96 J
