Physics 163

Unit 3: Motion in Two-Dimensions

Problem Set D

Problem 9:

In an ideal punt, the football has a 'hangtime' (total time in the air) of 5.0 s. If a punter kicks the ball at an angle of 46.1 degrees with the horizontal, what must be the initial velocity (in m/s) of the ball to achieve this?

• 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, of the trajectory characteristics and of the basic strategy for solving such problems is provided on the Set D Overview Page.

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

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