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Use the equation vf = vi + gt, where vf is final velocity, vi is initial velocity, g is acceleration due to gravity, and t is time.

Known:

vf = 0m/s

g = -9.8m/s2

t = 6s

Unknown:

vi

Equation:

vf = vi + gt

Solution:

vi = vf - gt

vi = 0m/s - (-9.8m/s2)(6s) = 58.8m/s = 60m/s (rounded to 1 significant figure)

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Q: When throw an object upward and return after 6 seconds what was its initial velocity?
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