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a massless string passes over a frictionless pulley and carries two masses m1 and m2(m1>m2) if g is acc. due to gravity then thrust on the pulley is?
at mass m1
m1g - T = m1a ...........1
at mass m2
T-m2g = m2a ..............2
solving these
T= 2m1m2/(m1+m2) ..........3
net force on the pulley = sum of tension in both the strings
F= T+T=2T
F(thrust) =4m1m2/(m1+m2) .........4
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