A 75-m-long train begins uniform acceleration from rest. The…

A 75-m-long train begins uniform acceleration from rest. The front of the train has a speed of 18 m/s when it passes a railway worker who is standing 180 m from where the front of the train started. (See Fig.) Determine the acceleration of the train. What will be the speed of the last car as it passes the worker?

An elevator that has a mass of 1450 kg including occupants i…

An elevator that has a mass of 1450 kg including occupants in a tall building is allowed to reach a maximum speed of 3.5 m/s going down.             (a) Calculate acceleration of the elevator over a distance of 2.6 m as it comes to stop.             (b) What must the tension be in the cable to stop this elevator over a same distance?