Mechanics: 1-Dimensional Kinematics

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1-Dimensional Kinematics: Audio Guided Solution

Problem Set K4, Question 6:

Jasmine swims the length of a 46.7-m pool in 21.2 s and then makes the return trip to the starting position in 23.7 s.
a. Determine Jasmine's average velocity (in m/s) in the first half of the swim.
b. Determine the value of Jasmine's average velocity (in m/s) for the entire round trip.
c. Determine the value of Jasmine's average speed (in m/s) for the entire round trip.

Audio Guided Solution

Part A Solution Description:

Audio Guided Solution

Part B Solution Description:

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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 itself. They equate given values to the symbols used to represent the corresponding quantites (e.g., v_o = 0 m/s; a = 4.2 m/s/s; v_f = 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 and be heavily dependent upon an understanding 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.

Read About It!

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

Speed and Velocity