Question

a body moves a distance of 10 m along a straight line under the action of force of 5N. if the work done is 25J, the angle which the force makes with the direction of motion of the body is

Answer 1

w= f.ds Cos (theta )
25 = 5 x 10 cos theta
cos theta = 1/2
Cos 60

angle then = 60 degree

Answer 2

W = f.ds ∅

25 = 5× 10 x ∅

∅ = 25 /5×10

= 1/2

we know that cos60° = 1/2

Then the angle is 60°