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A 45 kg block of ice slides down a frictionless incline l.5 m long and 0.91 m high, a worker pushes up against the ice, parallel to the incline, so that the block slides down at constant speed.
(a) Find the magnitude of the worker's force. How much work is done on the block by?
(b) The worker's force,
(c) The gravitational force on the block,
(d) The normal force on the block from the surface of the incline, and
(e) The net force on the block?
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a large asteroid of mass 77100 kg is at rest far away from any planets or stars. a much smaller asteroid of mass 610 kg
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