A 758 kg car moving at 25 m/s brakes to a stop. The brakes contain about 16 kg of iron that absorb the energy. What is increase in temperature of the brakes? Assume the specific heat of iron is 450 J=kg ¢ ± C. Answer in units of ±C. Q=mc(t1-t2) Ok I have the mass of the brakes and the specific heat and I know you only have to solve for the change in temperature, so I all need is Q. I know Q is measured in Joules and J=Newton x distance, but all I am given is the velocity of the car, nothing about time, distance, or Acceleration. So how do you figure the Q?