\mathbf{v}=10 x t \hat{\mathbf{i}}-5 y t \hat{\mathbf{j}} (a) |V| = ___________ ft/s where the velocity is in ft/s when x, y, and t are in feet and seconds, respectively. What

is the magnitude of (a) the velocity and (b) the acceleration at the point x = y = 3 at the time t = 0? (b) |a|=____________ ft/s^2 The velocity in a certain two-dimensional flow field is given by the equation