Question

Figure shows a uniform rod of length $30cm$ having a mass $3.0kg$. The rod is pulled by constant forces of $20N$ and $32N$ as shown. Find the force exerted by $20cm$ part of the rod on the $10cm$ part (all surface are smooth) is

• A. $36N$
• B. $12N$
• C. $64N$
• D. $24N$

Answer 1

The correct option is D $24N$

Acceleration of system

$\frac{32-20}{3}=4m/s\therefore AcctoFBDof1kg\&2kga=A=\frac{N-20}{1}=\frac{32-N}{2}N=24N$