Answer :
Given: v = 80 m/s
u = 0 m/s
t = 8 seconds
Now, we know, Acceleration, a = (v-u)/t ...(1)
Where, v = final velocity of the object
u = initial velocity of the object
t is the time-period
a = 
a = -10 ms-2
Frictional force = ma
= 
× -10
= - 0.5 N
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