Physics 163

Unit 3: Motion in Two-Dimensions

Problem Set C

Problem 17:

A student throws a baseball horizontally out a dorm room window 19.8 m above the ground. Another student standing a distance of 24.4 m from the dorm building catches the baseball at a height of 1.1 m above the ground. What is the initial velocity (in m/s) of the baseball?

• Read the problem carefully and diagram the physical situation (trajectory diagram)
• Identify known and unknown information in an organized manner (x-y table)
• 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

A discussion of the formulae for projectile motion and of the basic strategy for solving such problems is provided on the Set C Overview Page.

Detailed information about and discussion of the strategies for solving horizontally launched projectile problems is provided online at The Physics Classroom.

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