Question

In the figure the reading of the spring balance will be $:[g=10\frac{m}{s^2}]$

• A. $50N$
• B. $40N$
• C. $60N$
• D. $70N$

Answer 1

The correct option is C $60N$

The given arrangement can be reframed as shown. The FBDs are drawn to show the forces acting on the individual body.

So, the reading of the spring balance is given by the value of tension $T$
Hence, using the concept of pseudo force in the frame of entire system moving upwards with an acceleration $a=2m/s^2$ we get
From the FBD of either of the block ,tension in the string is $T=60N$.
Thus, spring balance reading is $60N$