One coolie lifts a suitcase by 2 m in 60 s, another lifts the same suitcase by 2 m in 30 s. Find ratio of powers of the first and second coolies.
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One coolie lifts a suitcase by 2 m in 60 s, another lifts the same suitcase by 2 m in 30 s. Find ratio of powers of the first and second coolies.

G1 Physics · Accepted Answer

Step 1 — Principle: Energy delivered over a time interval is E = Pt for constant power. Step 2 — Working: Each does identical work mgh. Step 3 — Working: Power is work divided by time, so P₁/P₂=(mgh/60)/(mgh/30)=30/60=1/2. Correct answer: D — 1 : 2.