A body moves a distance of 10 m along a straight line under the action of a forc

Question

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

Options:

A . 0∘

B . 30∘

C . 60∘

D . 90∘

Answer: Option C
:
C

W = F s c o s θ

\Rightarrow c o s θ = \frac{W}{F s} = \frac{25}{50} = \frac{1}{2}

\Rightarrow θ = c o s^{- 1} (\frac{1}{2})

\Rightarrow θ = 60^{\circ}

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