Question

find that at what distance body A will attain a velocity of 3 m/s when starts from rest. Assume coefficient of friction as 0.2 for block and surface and pulleys are frictionless and weightless

Answer 1

To find the distance, we need to find the velocity:

$$v=\sqrt{2ax}.$$

The acceleration can be found with Newton's second law. To determine the acceleration, attach the image. You can do this with any image-sharing service such as https://imgbb.com/ or https://pasteboard.co/