A car is traveling east at 50 km/h.It rounds a curve,and 5 s later it is traveling north at 50 km/h.The magnitude of the average acceleration of the car is
A) zero
B) 20 km/h · s
C) 10 km/h · s
D) 50 km/h · s
E) None of these is correct.
Correct Answer:
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