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l=h=45cm=0,45m
g=10N/kg
v=?
Ek=Ep
(mv²)/2=mgh|/m
v²/2=gh
v²=2gh
v=√2gh
v=√2*10N/kg*0,45m=√20m/s²*0,45m=√9m²/s²=3m/s