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Ek1= 1/2*3kg*2m/s
Ek1= 3 J
J-dżul
predkosc 2= 6m/s
3J*2= 6J
6J : 6m/s= 1kg
Ciało 2 ma mase 1kg.
E=mv^2/2=3*2^2/2=6J
ciało II. :
v=3*2=6m/s
Ek=mv^2/2
m=2Ek/v^2
m=2*6/6^2
m=0,33 kg