Question

A 20kg body is allowed to roll do an inclined plane 4m long with an inclination 30 degree. Calculate the work done. (g=10m/s)

Answer 1

$$F = mg\sin\alpha$$

$$F = 20*10*0.5 = 100 N$$

$$A = FS$$ $$A = 100*4 = 400 J$$

Answer: 400 J