Question

Find the force of interaction between $2kg$ and $1kg$ bodies for the figure shown. (Take $g=10m/s^2$)

• A. $25N$
• B. $30N$
• C. $45N$
• D. $50N$

Answer 1

The correct option is A $25N$

Taking the bodies as a single system, we can draw its FBD as


Hence, net force $=48-30=18N$ (down the plane)
$\Rightarrow a=\frac{18}{6}=3m/s^2$

Now, draw the FBD for the $1kg$ block

$N_1+8-30=1.a$
$N_1=33-8=25N$