Assume all strings and pulleys are ideal and all surfaces are frictionless unless specified. 1. A worker pushes two crates across a level, frictionless floor with a horizontal force of 150 N. Crate A has a mass of 75 kg and Crate B has a mass of 25 kg. Calculate the acceleration of the crates and the normal force between the crates. HAB А В

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!