A 100 kg car traveling at 20 ms collides with a 100 kg car

A 100 kg car traveling at 20 m/s collides with a 100 kg car traveling at 8 m/s in opposite direction,

a) if the two cars stick together, what is their final velocity?

b) how much kinetic energy is lost?

c) What percentage of the original kinetic energy of this?

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