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Vi=12m/s
Vf=0
g=9.8m/s
a)......
Vf^2=Vi^2-2gh
Vi^2=2gh
h=Vi^2/2g
h=(12m/s)^2/(2x9.8m/s^2)
h=144/(19.6)
Hmax=7.34m
b)......
Vf=Vi-gt
t=Vi/g
t=(12m/s)/(9.8m/s^2)
t=1.22s
t=1.22s(2)
t=2.44s