A body travels 10 m along a straight line under a 5 N force. If work done is 25 J, find the angle between force and displacement.
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Question

A body travels 10 m along a straight line under a 5 N force. If work done is 25 J, find the angle between force and displacement.

G1 Physics · Accepted Answer

Step 1 — Principle: For constant force, mechanical work is the scalar product of force and displacement. Step 2 — Working: W=Fs cosθ, so 25=5×10 cosθ. Step 3 — Working: cosθ=1/2 and θ=60°. Correct answer: A — 60°.