Answer to Question #348899 in Physics for Grace Nate

Question #348899

What is the kinetic energy of a 1,500-kg car traveling at 110 kph if the car can reach this velocity in 12 seconds starting from rest? What is the power output of the engine in HP?

Expert's answer

Given:

$m=1500\:\rm kg$

$v=110\:\rm km/h=30.6\:\rm m/s$

$t=12\:\rm s$

P=\frac{W}{t}=\frac{\Delta E}{t}=\frac{mv^2}{2t}

P=\frac{1500*30.6^2}{2*12}=5.84*10^4\:\rm W=78.3\:hp

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