A particle moves from (−2î + 5ĵ) m to (4ĵ + 3k̂) m under a constant force (4î + 3ĵ) N. Find the work done.

Question

G1 Physics · Accepted Answer

Step 1 — Principle: For constant force, mechanical work is the scalar product of force and displacement. Step 2 — Working: Displacement Δr=(2î−ĵ+3k̂) m. Step 3 — Working: Work W=F·Δr=(4)(2)+(3)(−1)=8−3=5 J. Correct answer: C — 5 J.