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Fran is standing near the front of a car in a train and Brad is standing...

Fran is standing near the front of a car in a train and Brad is standing near the back of the same car.  Fran and Brad have a catch with a ball and, as measured with respect to someone riding in the train, each is throwing the ball so that it leaves their hands at a speed of 20 m/s. Each takes 1/4 second to throw the ball. Assume that the force that each of them exerts on the ball is uniform throughout the 1/4 second of the throw, and that the ball has a mass of 0.15kg. Take the direction to the front of the train as positive. Finally, assume that all the motion is in the horizontal direction only; ignore any vertical velocity component and the acceleration due to gravity.

What is the velocity of the ball in m/s when it leaves Fran’s hand (include a + or - sign for the direction as appropriate)?

What is the velocity of the ball in m/s when it leaves Brad’s hand (include a + or - sign as appropriate)?

What is the acceleration of the ball in m/s2 while Fran is in the act of throwing it but has not yet released it (include a - sign if appropriate)?

What is the acceleration of the ball in m/s2 while Brad is in the act of throwing it but has not yet released it (include a - sign if appropriate)?

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