The rectangular coordinates of a particle which moves with curvilinear motion are given by x=10.25t + 1.75 - 0.45r and y = 6.32 + 14.65t – 2.48r, where x and

y are in millimeters and the time t is in seconds, beginning from t = 0. Determine the velocity v and acceleration a of the particle when t=5 s. Also, determine the first time that the velocity of the particle makes an angle of 45° with the positive x-axis.