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t=60 detik
a=5m/s²
a.jrak
s=v . t+1/2at²
s=20.60+1/2 5 .3600
s=1200+9000
s=10200m
b.hmax=17,5
dit V0??
Hmax=V0²/2g
17,5=V0²/20
350=V0²
V0=√350
V0=5√14 m/s