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

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.