A 3.0-kg cat runs to the left at 10 m/s and a 10-kg dog runs to the right at 4.0 m/s. The total kinetic energy is
A. 146 Joule.
B. -35 Joule.
C. -70 Joule.
D. 230 Joule.
E. 0.
Answer: D
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Fill in the blank(s) with the appropriate word(s).
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