1. The problem statement, all variables and given/known data A flywheel of radius 0.20 m with moment of inertia 0.15 kg/m^2 rotates at 180 revolution per minute . A tangential force is applied on the rim of the flywheel and it stops after 12 revolutions.Calculate the angular deceleration . 2. Relevant equations 3. The attempt at a solution The initial angular velocity is 18.9 rad/s after conversion. The time taken for 12 revolutions is 4s (since it can rotate 180 times in 60 s , so in 4 s , it can rotate 12 times) . Final angular velocity is 0 . Using [tex]\omega_f=\omega_i+\alpha t[/tex] [tex]0=18.9+4\alpha[/tex] solving this , i got 4.37 sec but the ans given 2.37 sec, where did i go wrong ?