A railroad car, of mass 200 kg, rolls with negligible

Last updated: 7/31/2022

A railroad car, of mass 200 kg, rolls with negligible friction on a horizontal track with a speed of 10 m/s. A 70-kg stunt man drops straight down a distance of 4.0 m, and lands in the car. How fast will the car be moving after this happens? 7.4 m/s 2.8 m/s 10 m/s 4.7 m/s