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3-8 Find the velocity, acceleration, and speed of a particle with the given position function. Sketch the path of the particle and draw the velocity and acceleration vectors for the specified value of t. 3. r(1) = (-212, 1), 1=2 4. r(1) = (2 - 1, 4Vt), 1 = 1 5. r(t) = 3 costi + 2 sintj, t = /3 6. r(t) = e'ite"j, 1=0 ai S1 nousup 7. r(t) = ti + t j + 2k, 1= 1 8. r(t) = ti + 2 costj + sintk, ' t = 0 m