Verified answer

23 km/h = 6.6666m/s

apply kinetic energy = 1/2*mass*velocity^2

Ek = 1/2*(2*10^5)*6.66666^2

Ek = 4,444,435.5J

Now apply kinetic energy = 1/2*m*v^2 for the car

4,444,435.5 = 1/2*1900*v^2

4,444,435.5 = 950v^2

v^2 = 4678.35

v = 68.398 m/s

So the compact car must go at 68.398 m/s.

Hope this helps