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a = - 2 m/s²
vt = 0
s = ?
vt = vo + at
0 = 30 + (-2)t
2t = 30
t = 15 s
s = vot + 1/2 at²
s = 30 x 15 + 1/2 (-2) 15²
s = 450 - 225
s = 225 m