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= (30 m/s)² / 2 (10 m/s²)
= 900 m²/s² / 20 m/s²
= 45 m
Vt = Vo - gt
0 = 30m/s -10m/s² (t)
10 m/s² (t) = 30 m/s
t = 30m/s / 10m/s²
= 3 sec
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