is answer 1and 3
6 Answers
Lokesh Verma
·2009-03-29 09:05:47
let friction F
F=-ma a=-F/m
torque Fr=-mr2α
α=-F/rm
v=v-F/mt
ω=2V/r-F/rmt
at time t, when pure rotation,
v-F/mt+2V/-F/mt=0
F/mt=3V
t=3V/μg