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Power P = W/t. Find the ratio P1/P2 = t2/t1 = 30s/60s = 1/2.

1. P1/P2 = t2/t1 = 30s/60s = 1/2
2. Constant power of car P0 = F.V = ma.V
3. P0 = m.dv/dt.v, P0dt = mv.dv Integrating
4. P0.t = mv²/2, v = √(2P0t/m)

Correct answer: P1/P2 = t2/t1 = 30s/60s = 1/2

Solution

The question directly asks for the ratio of powers P1/P2 based on the given times t1 and t2. Using the formula P = W/t, the ratio P1/P2 = t2/t1 = 30/60 = 1/2 is correct.

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