A rock is rolled in the sand.It starts at 5.0 m/s,moves in a straight line for a distance of 3.0 m,and then stops.What is the magnitude of the average acceleration?
A) 1.8 m/s2
B) 4.2 m/s2
C) 5.4 m/s2
D) 6.2 m/s2
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