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A 4 kg toy car with a speed of 15 m/s collides head-on with a stationary...

A 4 kg toy car with a speed of 15 m/s collides head-on with a stationary 1 kg car. After the collision, the cars are locked together with a speed of 12.0 m/s. How much kinetic energy is lost in the collision?

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Answer #1

Use the initial and final kinetic energy of the system to find the kinetic energy lost in the collision as shown below

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