(12.210)-The 16-ft-long cord is attached to the pin at C and passes over the two pulleys at A and D. The pulley at A is attached to the smooth collar that travels along the vertical rod. When SB= 6ft the end of the cord at B is pulled downwards with a velocity of 4ft and is given an acceleration of 3ft Determine the velocity and acceleration of the collar at this instant.
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