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a = 14m/s
2 detik kemudian =...
a = 14 m = 1 s
28 m = 2s
20 -28 = -8m/s
vt=14 m/s
t=2 s
a=..?
a=vt-v0/t
a=14-20/2
a=-6/2
a= -3 m/s^2