6. Intro to Forces (Dynamics)
Forces in 2D
5PRACTICE PROBLEM
Bob observes his phone dangling from a cord while the train he is in accelerates out of the station, lasting about 18 s. If the cord forms an angle of 26° with respect to the vertical during this acceleration, estimate the speed of the train at the end of the 18 s.
![image image](https://static.studychannel.pearsonprd.tech/courses/physics/thumbnails/e9494253-2b67-4a98-bd4b-ec0e8e1064da)
Bob observes his phone dangling from a cord while the train he is in accelerates out of the station, lasting about 18 s. If the cord forms an angle of 26° with respect to the vertical during this acceleration, estimate the speed of the train at the end of the 18 s.