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Avg retardation= v-u/t
                        = 0-20/5
                        = -4 m/s
0 0 0
can u pls mark my answer as brainliest?
Retardation is nothing but negative acceleration I.e final velocity is less than initial velocity
so (-a)=v-u/t
= -4m/s×s
0 0 0
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