A 2.00-kg object traveling east at 20.0 m/s collides with a 3.00-kg object traveling west at 10.0 m/s. After the collision, the 2.00-kg object has a velocity 5.00 m/s to the west. How much kinetic energy was lost during the collision?
A) 0.000 J
B) 458 J
C) 516 J
D) 91.7 J
E) 175 J
Answer: B
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A.
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B. 
N + e+ + ?
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D.
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