look......

Hydhyd.......the problems that u might hav seen might be of the sort in which the disc climbs up on a smooth track................in which case we can go by ur method by conserving the energy......but in this case evry one will agree with me that this is undergoing an inelastic collision........ so clearly energy cannot be conserved........

as far as the soln. is concerned u cud find it in JPNP or Arihant or any other reputed book..........

as far as ehsaan is concerned......i might have made a silly mistake........i am in the habbit of making many........

but the main logic remains the same.......conserve angular momentum abt the pt of contact...................

if u guys have any further doubts in my method or the principle that i apply......u cud call an expert to look into this one............to clear misconceptions of anysort on my part or on anyone else's part..........

as far as im concerned.....my main logic is conservation of angular momentum abt pt of contact.......

LK sir ka question hai na?? Its a good one

And answer and method both confirmed frm JPNP.........so if u ppl have ne further probs. u can ask for an expert to come and have a look in.........