# physics

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A 1000 kg sports car accelerates from 0 to 30 m/s in 10 s. What is the average power of the engine?

• physics -

Power is work done per unit time.

Average power is increase in work/energy divided by the duration for the increase.

initial kinetic energy, Ei = 0
final kinetic energy, Ef
= (1/2)mv²
= (1/2)1000 30² kg-m²-s-2
duration, t = 10 s

Average power
= (Ef-Ei)/t
= 45,000 W (or joules-s-1

• physics -

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