# physics

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How long will it take an 850 kg car with 40 hp (horsepower) to reach the speed of 15 m/2, neglecting friction?

40 hp=29840 watts

I know P=W/t but what is W?

• physics -

CORRECTION: that is supposed to be 15m/s NOT 15m/2

• physics -

P= mas
here, m=mass
a=accleration
s=distance

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