a carpenter of mass 50 kg is standing on a weighing machine placed in a lift of mass 20 kg - Physics - Laws Of Motion

Question

a carpenter of mass 50 kg is standing on a weighing machine placed
in a lift of mass 20 kg a light string is attached to the lift the
string passes over a smooth pulley and is attached to the lift and
the other end is held by the carpenter when carpenter keeps the
lift moving upward with constant velocity, find-​1 reading of
the weighing machine​2 net force on the man ​3 net
force on the weighing machine ​4 tension of the string

Apurba Paul · Accepted Answer

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Suppose T is the tension Then weight on the weighing machine is
m1g-T and now tension T is m2g+(m1g-T) Now equating We get
2T=m1g+m2g or T=m1+m2g2 Now putting the values we will get T=35g So
weight on wighing machine is 15kg So net force on the man is
m1g-T=15g So the net force on the wighing machine is also same as
net force on the man which is again 15g