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pl=pp
m1v1=m2v2=>v1=m2v2/m1
v1= 5*10/50=1m/s (predkosc pierwszego lyzwiarza)
2. lyzwiarz:
pl=pp
m3v3=m2v2=> v3= m2v2/m3
v3= 5*10/40= 1,25m/s (predkosc drugiego lyzwiarza)
vcal= v1+v3= 1m/s+1,25m/s= 2,25m/s