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# what is the average power generated by a 1200 kg car as it accelerates from rest to 20 m/s in 10 s?

### 5 Answers

- MyRankLv 66 months ago
Given,

Average Power (Pavg) =?

Mass (m) = 1200 kg

Initial Velocity (u) = 0m/sec

final Velocity (v) = 20 m/sec

Time (t) = 10 sec

We know that,

Average Power (Pavg) = Energy change/ Time

= [½ m (Δv)²]/ Time (t)

= m (v - u)²/ 2 x t

= (1200 [20 - 0]²)/ 2 x 10

= (1200 x 400)/ 20

= 24000 W

∴ Average Power (Pavg) = 24 kw

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- Anonymous6 months ago
you eat fart and smell fart

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- electron1Lv 76 months ago
The first step is to calculate the car’s kinetic energy.

Initial KE = ½ * 1200 * 20^2 = 240,000 J

Power = 240,000 ÷ 10 = 24,000 watts

- Andrew SmithLv 76 months agoReport
which means 24 kW or about 31 Hp at the wheels. The engine develops more than this but some of the power is used for other purposes.

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- oldschoolLv 76 months ago
Yeah, yeah..... just gimme the answer and I might award best answer but probably not.

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- sojsailLv 76 months ago
Two steps:

1. Calculate the kinetic energy of the car at 20 m/s.

2. Divide by the time to reach that speed.

Watts are equivalent to Joules/sec

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