Suppose the position vector for a particle is given as a function of time by r(t) = x(t)î + y(t)j, with x(t) = at + b and y(t) = ct + d, where a = 1.40 m/s, b = 1.50 m, c = 0.121 m/s and d = 1.10 m. (a) Calculate the average velocity during the time interval from t = 1.85 s to t = 3.80 s. m/s (b) Determine the velocity at t = 1.85 s. v = m/s Determine the speed at t = 1.85 s. m/s

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