Fjee para

This has been discussed earlier...wait let me search for the link

Found the link...aah...but sorry not discussed

http://www.targetiit.com/iit-jee-forum/posts/straight-from-fiitjee-s-gmp-11838.html

oops. should have mentioned to just give the exp. of KE of pulley S..(for first bit)

and yeah the above work is definitely correct