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vf=vi-g.t
0=vi-9.8*8
vi-9.8*8=0
vi-78.4=0
vi=78.4 m/s
vf²=vi²-2gh
0=78.4²-2(9.8)*h
0=6.146-19.6*h
0=6.126*h
h=6.146 m