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A car with mass 450 kg has a kinetic energy of 16,256 J. What is the speed of the car? A. 5.9 m/s B. 1.2 m/s C. 8.5 m/s D. 11.2 m/s
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A car with mass 450 kg has a kinetic energy of 16,256 J. What is the speed of the car?

A. 5.9 m/s
B. 1.2 m/s
C. 8.5 m/s
D. 11.2 m/s

User Dawid Toton
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6.1k points

1 Answer

3 votes
The equation for kinetic energy is
E = 1/2 m v^2
Isolating for the speed gives us
v = sqrt(2E/m),
that is the square root of 2 times the energy divided by the mass.
This gives us a speed of
v = 8.5 m/s
So the answer is C.
User Moini
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6.1k points
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