Physics 163

Unit 3: Motion in Two-Dimensions

Problem Set A

Problem 10:

A jogger runs 70 m due west, then changes direction and runs 76 m due north. She then heads west again and finishes a total distance of 371 m from her starting location. What was the length (in meters) of her third displacement?

• 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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