Question

Two masses of $10kg$ and $5kg$ are suspended from a rigid support as shown in the figure. The system is pulled down with a force of $150N$. The string attached to the support breaks and the system accelerates downwards. In case the force continues to act what will be the tension acting between the two masses?

• A. 300 N
• B. 200 N
• C. 100 N
• D. zero

Answer 1

Answer: (C)

100 N

Taking whole thing as a system net force acting on the system is given by,
$F=(10+5)\times g+150N$
Therefore ,acceleration will be,
$a=F/M$
$a=20$.
Now,forces acting on 10 kg mass is the net sum of tension in the string and its weight.
$F=T+100$
$10\times a=T+100$
$200=T+100$
$T=100N$