Ep = Ek
mgh = mV²/2 |*2
2mgh = mV² |:m
2gh = V²
V = √2gh
V = √(2*10m/s²*45m)
V = √900m²/s²
V = 30m/s
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h=45m
mv²:2=mgh / :m
v²=2gh
v²=900m²/s²
v=√900m²/s²
v=30m/s
Ep = Ek
mgh = mV²/2 |*2
2mgh = mV² |:m
2gh = V²
V = √2gh
V = √(2*10m/s²*45m)
V = √900m²/s²
V = 30m/s