Kinetic Energy: A 1.0-kg object moving in a certain direction has a kinetic energy of 2.0 J. It hits a wall and comes back with half its original speed. What is the kinetic energy of this object at this point?
A. 2.0 J
B. 1.0 J
C. 0.50 J
D. 0.25 J
E. 4.0 J
Answer: C
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