Find the acceleration if the intial velocity is 4m/s in time 8.4
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u = 4m/s
t = 8.4 s
v = 0[its clear from the question]
a = v-u/t = 0-4/8.4 = -4/8.4 = -4*10/84 = -40/84 = -20/42 = -10/21
a = -10/21 [ retardation] or negative acceleration.
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