Momentum: Three objects are moving along a straight line as shown in the figure. Taking the positive direction to be to the right, what is the total momentum of this system?
A. +106 kg ? m/s
B. -106 kg ? m/s
C. +14.0 kg ? m/s
D. -14.0 kg ? m/s
E. 0.00 kg ? m/s
Answer: D
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