A body moves a distance of 5m along a straight line under the action of a force of 15N. If work done by this force is 45J, the angle which the force makes with the direction of motion with the horizontal is
A
37∘
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B
30∘
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C
60∘
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D
53∘
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Solution
The correct option is D53∘ Given, distance(displacement) travelled by body along the straight line =5m
Force applied =15N
Work done by force (W)=45J
If both force and displacement are along the same direction. ∴ Workdone (W)=F.s=15×5=75J
But the given workdone is equal to 45J
Therefore, the force is acting on a body by making an angle with direction of motion.
Let the angle be ′θ′