Answers

2014-09-13T17:20:36+08:00
T=?
d=80 m
g=9.8 m/s∧2
equation: "t=√(2d/g)"
t= √[(2*80)/9.8] 
t=√(160/9.80)
t=√16.32653061
t=4.040610178 seconds~~~~4 seconds
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