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v = 12 -2t i
kecepatan awal partikel berarti v saat t= 0
v = 12 m/s i
b) a = dv/dt
a = -2 m/s² i
c) v saat t= 5
v = 12-2(5) i
v = 2 m/s i
3.a) a = dv/dt
v = dr/dt
v = 3t +0,5
a = 3 m/s² i
b) v saat t=5s
v = 3t +0,5
v = 3(5) +0,5
v = 15,5 m/s i