Resistance

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An SUV with mass 1135 is driving on the highway at 40 m/s. A car with mass 955 kg is approaching from behind at a speed of 60 m/s. The car slams into the back of the SUV, which causes the car to slow down to 51 m/s. How much energy was lost in the collision? Ignore any effects due to air resistance or friction from the road. kJ