Marcus is on a train that travels 20 and takes 5 seconds to slow to 10 How would Marcus correctly calculate the acceleration? (10-20) a = A = -2 m/s? %3D (0-20) a = = -4 m/s2 (20-10) C a = = 2 m/s2 (20-0) a = = 4 m/s? 5

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