1u hv used mv+Iw=constant but here Fext and Text are not zero
3 Answers
33before collision <--- 7 and w is anticlockwise 7/R
after just after collision --->7 and w is w is anticlockwise 7/R
Now after some time when pure rolling starts let velocity be v.
-(2MR2/5)7+m7R=7MRv/5
v=3
133have applied conservation of angular momentum about bottom most point... and net torque about that point is zero.. as friction and gravity passes through that point..
