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Problem 4. Collar A starts from rest att 0 and moves upward with a constant acceleration of 3.6 in./s2. Knowing that collar B moves downward with a constant velocity of 18 in./s, determine (a) the time at which the velocity of block C is zero, (b) the corresponding position of block C Problem 5. The three-dimensional motion of a particle is defined by the position vector r (Rtcos cwt) i ctj +(Rtsin wt) k. (The space curve described by the particle is a conic helix.) Determine the magnitudes of the velocity and acceleration of the particle as functions of t.

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