Question

From the given system, just after cutting the string connecting $m_4$ and ground, (here $(m_1+m_2)>(m_3+m_4)$)

• A. Acceleration of $m_3$ is upwards
• B. Acceleration of $m_1$ is zero
• C. Acceleration of $m_2$ is downwards
• D. Acceleration of $m_3$ is zero

Answer 1

Answer: (B), (D)

The correct options are
B Acceleration of $m_1$ is zero
D Acceleration of $m_3$ is zero

After cutting the string, force on $m_4$ changes, so it accelerates upwards. However, the springs are still expanded, so the tension in the springs remain the same. Therefore, at that instant, the blocks $m_1,m_2$ and $m_3$ are still at rest.