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t = 4s
vt = 0
s = ?
vt = vo + at
0 = 20 + 4a
4a = -20
a = -5m/s²
s = vot + 1/2 at²
s = 20x4 + 1/2 x(-5) x 4²
s = 80 - 40
s = 40 m