Rotation 4

For pure rolling;
R(w_0-alpha.t)=at
a=u(mew)g
0.5mr².alpha=f(r)
hence substitute n find the value of t

ITS 1.35s....option b.....take
w0-alpha.t=w
and v=at

now take v=wr and solve...

No i solved it and got the answer approximately equal to d.
I guess d is rite..
Pls specify the correct answer anirban..

sorry wrong ans. it is (d)

anjalee u r rite...........plz give the method

@anirban:Hey did u understand my approach??