1. A ball with a mass of 10 kg is hanging from a long string that is tied to the ceiling of a train car traveling eastward on horizontal tracks. An observer inside the train car sees the ball hang motionless. Draw a clearly labeled free-body diagram for the ball if (a) the train has a uniform velocity, and (b) the train is speeding up uniformly. (c) Is the net force on the ball zero in either case? Explain. (d) If the train stops from 60 km/h velocity within 5 s, draw a clearly labeled free-body diagram for the ball and compute for the tensional force on the string (assumes that the string didn’t break).

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