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v1 = 2m/s
v2=3m/s
m2 v2 = (m1+m2) v1
m2 v2 = m1v1 + m2v1
m2v2 - m2v1 = m1 v1
m2 (v2-v1)=m1 v1
m2= m1 v1 / v2-v1
m2=25 x 2 / 3-2
m2=50kg
Masa Moniki wynosi 50kg.