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

Discussion Forum : Work Power And Energy

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^{\circ}

B .

30^{\circ}

C .

60^{\circ}

D .

90^{\circ}

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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