A) \[\frac{2\pi r}{u}\]
B) \[\frac{4\pi r}{u}\]
C) \[\frac{3\pi r}{u}\]
D) \[\frac{12\pi r}{u}\]
Correct Answer: B
Solution :
[b] If just after collision, relative velocity = v then \[\frac{v}{u}=\frac{1}{2}\therefore {{\omega }_{\operatorname{rel}}}=\frac{v}{r}=\frac{u}{2r}\] \[\therefore \] time between 1st and 2nd collision, \[t=\frac{2\pi }{{{\omega }_{\operatorname{rel}}}}\] \[=\frac{4\pi r}{u}\]
You need to login to perform this action.
You will be redirected in
3 sec
