A car travels north at 30 m/s for one half hour. It then travels south at 40 m/s for 15 minutes. The total distance the car has traveled and its displacement are:
A. 18 km; 18 km S.
B. 36 km; 36 km S.
C. 36 km; 36 km N.
D. 90 km; 18 km N.
E. 90 km; 36 km N.
Answer: D
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