Please note: Daily practice problems will be unavailable June 10 through August 15 while the site takes time off over the summer.
You may sign up to receive problems via 
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@learnapphysics. The daily problem service is currently inactive for the summer, but will resume August 15, 2019.
In the meantime, you're welcome to see AP Physics 1 and 2 and AP Physics C problems from the archives.
See the solution.
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LearnAPphysics tweets a Problem of the Day during the school year, August 15 - June 15. Follow @learnapphysics on Twitter to be notified of problems.
Enjoy your summer and we'll see you in the Fall!