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physics

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A 3 kg toy car with a speed of 10 m/s collides head-on with a 2 kg car traveling in the opposite direction with a speed of 3 m/s. If the cars are locked together after the collision with a speed of 4.80 m/s, how much kinetic energy is lost?

  • physics - ,

    find the velocity after collision:

    3*10+2*(-3)=((3+2)V

    V=(30-6)/5=5m/s

    KE= 1/2 m v^2=1/2 (5)(25)=75/2 Joules

    What was the starting energy?
    1/2 (3*100)+1/2*2*9=159Joules
    check my math.

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