Suppose the position vector for a particle is given as a function of time by r(t) = x(t)î + y(t)ĵ, with x(t) = at + b and y(t) = ct² + d, where a = 1.80 m/s, b = 1.20 m, c = 0.120 m/s², and d = 1.02 m. (a) Calculate the average velocity during the time interval from t = 2.10 s to t = 3.85 s. v= m/s (b) Determine the velocity at t = 2.10 s. v= m/s Determine the speed at t = 2.10 s. m/s

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Projectile Motion