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4. A 700-kg horse A lifts a 50-kg hay bale B as shown. At the instant when r= 8 m and 0=
60°, the velocity and acceleration of the horse are 2 m/s to the right, and
0.5 m/s to the left, respectively. Neglecting the mass of the pulley, determine at that instant,
(a) the tension in the cable, (b) the average horizontal force between the ground and the
horse's feet.
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