Question

A man of mass $60kg$ is standing on a weighing machine (massles) kept in a box of mass$30kg$ as shown in a diagram. If the man manages to keep the box stationary the reading of the weighing machine is

• A. $150N$
• B. $600N$
• C. $300N$
• D. $400N$

Answer 1

The correct option is C $300N$

To keep the box stationary

Tension(T) in rope= $mg$

(mass of the box) m= $30kg$

$T=300N$

and Now, FBD of person

So, acceleration= $(600-300)/60m/s^2$

$=5m/s^2$

So, relative acceleration = $(g-5)m/s²$

Reading of the weighing machine

$=m^{\prime }\times 5$

$=300N$

So Correct Ans. is (C).