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m=2kg
h=1m
Ek=5J
g=10m/s²
szukane
v=?
Ep= m*g*h
Ep=2*10*1 =20J
Em=Ep+Ek
Em=5J+20J=25J
Eko=Em
Eko=25j
Eko=m*v²/2
v²=2Eko/m
v²=2*25/2
v=√25
v=5m/s prędkośc początkowa