**I know this question has been posted before in the forum but I would really appreciate if if someone could explain to me why would the velocity be maximum at the ends if this is a harmonic motion. I thought that, like the case in springs maximal kinetic energy is at x=0. Any help would be appreciated.**

**Also question number 29 when they ask about which work is greater in magnitude, lifting the block from position A to B or moving it from B to A. Isn't the former one gonna require more work since the Tension force exerted by you through the pulley needs to overcome the gravitational force to lift the mass and therefore the work done here will be greater.**

Thank you very much for any help in advance.

Good luck to everyone studying.

Thank you very much for any help in advance.

Good luck to everyone studying.