Power

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Question

A car of mass 1000 kg accelerates uniformly from rest to a velocity of 54 km/h in 5 s. The average power of the engine during this speed is(neglect friction):

Easy

Solution

Av. Power = $\frac{\frac{1}{2} {mv}^{2}}{t} = \frac{\frac{1}{2} \times 1000 \times {(15)}^{2}}{5} = 22500 W$

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