A) A runaway train car that has a mass of 19,743 kg travels at a speed of 8 m/s down a track. Compute the time required for a force of 1,945 N to bring the car to rest. The answer has units of seconds. B) a runaway train car that has a mass of 15,000 kg travels at a speed of 5.4 m/s down a track. How much work is done by the force to bring it to rest? (answer is in Joules) C) A runaway train car that has a mass of 15,000 kg travels at a speed of 5.4 m/s down a track. A force of 1500 N brings the car to rest. How far (in meters) does the train travel while stopping