A block of mass 10kg is moved at a constant speed through a horizontal distance of 4m, by applying a force 50N. How much work has been done when the force is applied in direction?

1- in the same direction of displacement

2- at an angle of 30 with displacement

Explanation:

given that

mass = 10kg

distance = 4m

force = 50N

to calculate the workdone when the force is applied in the same direction of displacement

mathematically,

workdone = force × distance

Workdone = 50 × 4

workdone = 200 joules

2) to calculate the workdone at an angle of 30° with the displacement we apply the formula

workdone = force × distance × cos Ф

workdone = 50 × 4 × cos 30°

workdone = 200 × 0.866

workdone = 173 . 2 joules