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A 1-kg of wood is pressed against a vertical wall (µs= 0.25) by a force inclined 40º upward with respect to the vertical axis.
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A 60 kg package rests on the level floor of a warehouse.
A 1340 kg Triumph TR-8 traveling north at 43 km/hr crashes head-on into a 1850 kg Checker cab moving west at 87 km/hr.
A charge of -7 x 10-8 C exerts a force of 0.045 N on a charge of +6.0 x 10-7.
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