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15.2 kg object travelling with a velocity of 7.3 m/s north collides with a 10.0 kg stationary object. After the collision, the 15.2 kg object travels with a velocity of 4.3 m/s 20° E of N.

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

b. Is the collision elastic or inelastic closed Show your work .