Two toy cars hit each other and have a perfect bounce. The mass of the 1st car is 7kg and it is going 2 m/s before the collision and -6.33 m/s after the collision. The 2nd car (mass 5kg) starts by going -8 m/s before the bounce/crash. What is the velocity of the 2nd car after the bounce? (ignore friction/heat losses and round to the nearest 100th)

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.

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