Answers

2016-02-14T14:48:48+05:30
Avg retardation= v-u/t
                        = 0-20/5
                        = -4 m/s
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2016-02-14T15:52:02+05:30
Retardation is nothing but negative acceleration I.e final velocity is less than initial velocity
so (-a)=v-u/t
=0-20/5
= -4m/s×s
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