a bus decreases it's speed from 80 kmph to 60 kmph in 5 second . fìnd it's retardation.
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u = 80km/h = 80*5/18 = 22 m/s
v = 60 km/h = 16 m/s
t = 5s
a = v-u/t
a = 16-22/5
a = 6/5
a ≈ 1.2 m/s²
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