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a bus decreases its speed from 80kmh-1to 60kmh-1 in 5 sec find the acceleration

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60,000 m/3600 s = 16.7 m/s
80,000 m/3600 s = 22.2 m/s

(16.7 - 22.2)m/s / 5 s = -1.11 m/s^2

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