Figure shows a man of mass 48 kg standing on a light weighing machine kept in a box of mass 3kg. The box is hanging from a pulley fixed to the ceiling through a light rope, the other end of which is held by the man himself. If the man manages to keep the box at rest, the weight shown by the machine is _______ kg .

Answer

9

Explanation

`2T =78 g " " N+T=48 g`
`T=390 " " :. N=90`