Answer:
(i)
frmto
Thus, force is maximum in this period. (1)
(ii) a is negative fromto
(iii) From r=4sto?=8s,no force acts. (1)
(iv) y= 20 m/s from 4s to 8s. (1)
(v) dfrom0to4s= 5m/s
A from 4 to 8 s = 0 m/s2 (1)
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