Question

Two blocks A and B of mass 1 kg and 2 kg respectively ar4e connected by a string, passing over a light frictionless pulley. Both the blocks are resting on a horizontal floor and the pulley is held such that string remains just that. Att=0, a force F=20t N starts acting on the pulley along vertically upward direction as shown in figure, choose the correct statement(s):

• A. Velocity of A when B losses contact with the floor is $5m{sec}^{-1}$
• B. Velocity of A when B losses contact with the floor is $10m{sec}^{-1}$
• C. Height raised by the pulley up to that instant at $\frac{5}{6}m$ sec.
• D. Block 'A' loses contact with floor at t = 1 sec.

Answer 1

The correct option is C Height raised by the pulley up to that instant at $\frac{5}{6}m$ sec.

Hence, from the solution in the given figure,

We get option $C$ is the correct answer.