How much work is done by the gravitational force when a 265-kg pile driver falls 2.80m?

From center station, a train departs every 30 minutes on the fast line and a train departs every 50 minutes on the state line. if two trains depart from center station at 8: 00 a.m., one on each of the two lines, what is the next time that two trains, one on each line, will depart at the same time?

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

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