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=
= 4- 6t +3
untuk t=0, maka
V(0) = 4 - 6(0) + (0)²
= 4 m/s
untuk t=2
V(2) = 4-6(2)+(2)²
= 4-12+4
= -4m/s
kecepatan rata2 = 4+(-4) dibagi 2 = 0 m/s