Question

A force f = 10N, large and fixed direction. The shifting point of force shifts along a straight line of 5m in length. The f force forms the angle of the theta toward the displacement direction. It turns out the style of doing business by 25 joules. Large corner of the theta is ....

Answer 1

F = 10 N
S = 5 m
W = 25 J
Θ = __?

W = F S cos θ
25 = 10 • 5 • cos θ
½ = cos θ
Θ = 60 °

Answer 2

We know that, 

F = 10 N
S = 5 m
W = 25 J
Theta angle= ?

W = F S cos theta
25 = 10 * 5 * cos theta
25=50 * cos theta
1/2 = cos theta

1/2 cos theta= 60 °
Cos theta= 60 °

Your answer= 60°

Hope it helps you