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20. A disc of mass m and radius r rolls down an inclined plane without slipping from rest at a height h. The speed of its centre of mass, when it reaches the bottom, is : 21. A particle is located on the x axis at x = 2.0 m from the origin. A force of 25 N, directed 30° above the x axis in the x-y plane, acts on the particle. What is the torque about the origin on the particle? A) 50 N m, in the positive z direction B)25 N-m, in the positive z direction C) 50 N·m, in the negative z direction E) There is no torque about the origin. D) 25 N-m, in the negative z direction
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