la urcare
T-m1g=m1a
T=m1a+m1g
coborire
m2g-T=m2a
miscare uniformă
T=mg inlocuim in expresiile de sus
la urcare: mg=m1a+m1g
coborire: m2g-mg=m2a
egalam prin acceleratie si determinam masa
formula finala este
[tex]m=\frac{2m1*m2}{m1+m2} =\frac{2*800*1200}{800+1200} =960[/tex]
