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r t=2 = 2.2 - 4.2
r t=2 = 4 - 8
r t=2 = -4 m
r t=4 = 2t - 4t
r t=4 = 2.4 - 4.4
r t=4 = 8 - 16
r t=4 = - 8 m
V rata-rata = (r t=4 - r t = 2) : (t2 - t1)
V rata-rata = ( -8 - (-4)) : 4-2
V rata-rata = -4 : 2
V rata-rata = -2 m/s