Question

Two cars approach along icy streets which meet at a right angle to one another. The cars collide and stick together. One car has a mass of 1200 kg and had a speed of 30 km/h in the +x direction before the collision. The second car has a mass of 1500 kg and was traveling in the +y direction before the collision. After the collision, the wreakage moved off at an angle of 64o to the x axis.
a) What was the initial speed of the heavier car?
b) What percentage KE was lost in the collision?

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