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 = 1.60 m/s, b = 1.50 m, c = 0.117 m/s2, and d = 1.12 m. (a) Calculate the average velocity during the time interval fromt = 1.90 s to t = 3.85 s. v = m/s (b) Determine the velocity at t = 1.90 s. m/s Determine the speed at t = 1.90 s. m/s

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