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Verified answer
GLBBVt = Vo + at
18 = Vo + a(4)
18 = Vo + 4a
s = Vot + ½at²
200 = Vo(10) + ½ a(10)²
200 = 10Vo + 50a
20 = Vo + 5a
Vo + 5a = 20
Vo + 4a = 18
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a = 2 m/s²
Vo + 4(2) = 18
Vo = 10 m/s