A 2000 Kg Car Is Traveling at 15 $^{\circ}$ CWhat Is the Increase in the Temperature of the Brakes

A 2000 kg car is traveling at 15.0 m/s down a long mountain grade of 2.0%.The mountain road is 5.0 km long.The heat generated at the brakes due to friction heats up the brakes.The mass of the brake system is 20.0 kg and it has a specific heat of 0.200 kcal/kg $^{\circ}$ C.What is the increase in the temperature of the brakes?

A) 43 $^{\circ}$ C
B) 54 $^{\circ}$ C
C) 83 $^{\circ}$ C
D) 95 $^{\circ}$ C
E) 117 $^{\circ}$ C