12-217. The crate C is being lifted by moving the roller

Chapter 12, Problem 12-217

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12-217. The crate C is being lifted by moving the roller at A downward with a constant speed of vA = 2 m/s along the guide. Determine the velocity and acceleration of the crate at the instant s = I m. When the roller is at B. the crate rests on the ground. Neglect the size of the pulley in the calculation. Hint: Relate the coordinates .rc and xA using the problem geometry, then take the first and second time derivatives.

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