A 66 kg student traveling in a car with a constant velocity has a kinetic energy of 1.7 104 J. What is the speedometer reading of the car in km/h?
KE = 1/2 m v2
v =sqrt ( 2* KE/m) = sqrt ( 2 (1.7 x 10^4) / 66) = ...... m/s
+54 
