# Mechanics: 1-Dimensional Kinematics

## 1-Dimensional Kinematics: Audio Guided Solution

#### Extra Problem 14:

A train normally travels with a uniform speed of 88 km/hr on a long stretch of straight, level track. On a particular day, the train must make a 3.42 minute stop at a station along this track. If the train decelerates at a uniform rate of -1.87 m/s/s and accelerates at a rate of 0.75 m/s/s, then how much time (in minutes) is lost by the train in making the stop.

## Audio Guided Solution

Get more information on the topic of 1-Dimensional Kinematics at The Physics Classroom Tutorial.

## Habits of an Effective Problem Solver

An effective problem solver by habit approaches a physics problem in a manner that reflects a collection of disciplined habits. An effective problem-solver...

• ...reads the problem carefully and develops a mental picture of the physical situation. If needed, they sketch a simple diagram of the physical situation to help visualize it.
• ...identifies the known and unknown quantities in an organized manner, often times recording them on the diagram iteself. They equate given values to the symbols used to represent the corresponding quantity (e.g., vo = 0 m/s; a = 4.2 m/s/s; vf = 22.9 m/s; d = ???.).
• ...plots a strategy for solving for the unknown quantity; the strategy will typically center around the use of physics equations be heavily dependent upon an understaning of physics principles.
• ...identifies the appropriate formula(s) to use, often times writing them down. Where needed, they perform the needed conversion of quantities into the proper unit.
• ...performs substitutions and algebraic manipulations in order to solve for the unknown quantity.