1. The problem statement, all variables and given/known data Two coordinate systems xyz ( fixed) and x0y0z0 (moving) coincide at time t = 0. The moving system is rotating about the fixed z axis, which coincides with z0 axis. The angular velocity is given by ω = tk = tk0. The position vector as measured in the rotational frame is equal to r0 (t) = (t + 1) i0 + t^2 j0: 1. Using the rotating frame find v0. 2. Relevant equations ω = tk = tk0 r0 (t) = (t + 1) i0 + t^2 j0 3. The attempt at a solution So i know to find v0, i cannot just differentiate r0. but i am stuck.