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Physics Work,Power & Energy Level: High School

An 8.0 kg mass moving east at 15.6 m/s on a frictionless horizontal surface collides with a 10.0 kg object that is initially at rest . After the collision , the 8.00 kg object moves south at 3.90 m/s .

a) What is the velocity of the 10.0 kg object after the collision ?

b) What percentage of the initial kinetic energy is lost in the collision ?