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t=V:a
t=30m/s:10m/s^=3s
S=at^:2
S=10m/s^*3s*3s :2 = 45m
Ek=Ep
Ek=mv²/2
Ep=mgh
h=v²/2g
h=(900m²/s²)/(2*10m/s²)
h=45m
ok. 45m