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a = 4 m/s²
v0 = 20 m/s
t = 5 s
dit : vt ?
maka :
a = Δv/Δt
4 = (vt-v0) / (5-0)
4 = (vt-20)/5
5x4 = vt-20
20 = vt - 20
vt = 20+20
vt = 40 m/s
jadi kecepatannya = 40 m/s