1. The problem statement, all variables and given/known data I need to find the average acceleration of a gramophone record. Initial angular velocity, W = 0 Final angular velocity, w = 3.50rad s^-1 angular displacement, 8 = 0.25rad 2. Relevant equations The equation given by the answer is t= 8/w a = ( w - W ) / t the answer is 49.0 rad s-2 3. The attempt at a solution This is the equation I use w2 = W2 + 2a8 and I get 24.5rad s-2 But if I multiply it with 2, the angular acceleration will become 49rad s-2 That mean my equation will become w2 = W2 + a8 Can anyone explain this to me? Or I use a wrong equation?