Posted by **Allison** on Wednesday, July 13, 2011 at 4:42pm.

A car's engine can accelerate a car from rest to 30 m/s in 6 s. if the car's mass is 1300 kg, what is the power of the engine?

can someone give me the answer because i just want to verify it with my own?

thank you!

- PHYSICS!! -
**Allison**, Wednesday, July 13, 2011 at 4:51pm
the answer i got is 288600W

- PHYSICS!! -
**bobpursley**, Wednesday, July 13, 2011 at 5:13pm
power= work/time= 1/2 m v^2 / tune

I don't get that result.

- PHYSICS!! -
**Allison**, Wednesday, July 13, 2011 at 5:35pm
can you tell me exactly what you did instead of just giving me the formula?

please and thank you

- PHYSICS!! -
**CANTIUS**, Sunday, July 31, 2011 at 6:00am
To expand upon bobpursley's solution:

P = W/t =(1/2 m v^2)/t = (m v^2)/(2t)

m = 1300 kg, v = 30 m/s, t = 6 s

The work is equal to the change in kinetic energy, which, since it started from rest, is simply (1/2) m v^2

The formula given is the definition of power.

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