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v0 = 30 m/s
vt = 0
t = 2 s
dit : s ?
dijwab :
a = (v0-vt)/Δt
= (30-0)/2
= 15 m/s²
st = v0xt - 1/2xaxt²
= 30 x 2 - 1/2 x 15 x 2²
= 60 - 1/2 x 15 x 4
= 60 - 30
= 30 m