Physics 163

Unit 3: Motion in Two-Dimensions

Problem Set A

Problem 4:

A shopper pushing a cart through a store moves a distance 21.7 m down one aisle then makes a 90 degree turn to his right and moves 8.9 m. He then makes another 90 degree turn to his left and moves 12.2 m. How far (in meters) is the shopper away from his original position?

• Read the problem carefully and diagram the physical situation (vector addition diagram)
• Identify known and unknown information in an organized manner (label vectors)
• Take the time to plot out a strategy prior to beginning the solution
• Identify an appropriate formula to use
• Perform step-by-step algebraic manipulations

Detailed information about the addition of vectors is provided online at The Physics Classroom.

Detailed information about the counter-clockwise convention (CCW) for expressing the direction of vectors is provided online at The Physics Classroom.

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