An object having mass 4 kg begins at rest from the top of a rough inclined plane of height 10 m. When the speed of the object at the bottom of the inclined plane is around 10 m/s, determine how much work is done by the force of friction? Employ g = 10 m/s2.
i) -100 J
ii) 100 J
iii) 0
iv) -200 J
v) 200 J