A car with 2.71 Horsepower?

1. The problem statement, all variables and given/known data

A 1200 kg car accelerates from 0 to 27 m/s in 60 seconds.
a) What is the power outage from the engine in watts?
b) What is the power outage from the engine in horsepower?

2. Relevant equations

1/2 mgy=v
1 horsepower=746 Watts

3. The attempt at a solution

My final answer was 2025 Watts, 2.71 horsepower. Either I am way off, or my physics teacher is testing my confidence with physics. I’m guessing the former.

a) v=1/2(1200kg)(4.5m/s)2=12150 Joules=2025 Watts.
2025 Watts/746=2.71 horsepower.

Where did I go so terribly wrong?? :rofl:

Thanks!

http://ift.tt/1keop0I

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