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Q. A worker stands still on a roof sloped at an angle of 28° above the horizontal. He is prevented from slipping by a static frictional force of 470 N. Find the mass of the worker.

Q. A stone is dropped at t = 0. A second stone, with 5 times the mass of the first, is dropped from the same point at t = 130 ms. (a) How far below the release point is the center of mass of the two stones at t = 480 ms? (Neither stone has yet reached the ground.) (b) How fast is the center of mass of the two-stone system moving at that time?

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