In the amusement park ride Mr. Freeze, riders are uniformly accelerated from rest by magnetic induction motors along a 70 meter horizontal track in just 5 seconds. While accelerating, friction exerts 500N of force on the train. A train loaded with passengers has a mass of 2500 kg. Draw a force diagram for the train while accelerating. What force is exerted on the train (call it the applied force) while it is accelerating?

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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!