AP Physics 1 Exam Free Response Solution (2018 #5)

Link To 2018 Questions

This is a solution to AP Physics 1 Exam 2018 number 5. It talks about the period of a spring and how that relates to amplitude and period. This is a total inelastic collision so conservation of energy and momentum are used.

These questions are all property of college board. I did not make these questions and I have no affiliation with college board. These solutions are just my opinion.

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[ananyaanair]

Oh, thank you so much for this, Mr. Finn!! I appreciate it!

[sado]

My school for some reason doesn't offer ap physics 2, so I'm just kind of sad now, because my love for physics isn't getting an opportunity to show itself

[jamesharden]

Hello sir why are you posting this the exam is over but I appreciate your effort. Thank you

[esteenguyen]

When should I use Conservation of Energy (and also momentum)? I have trouble knowing when to use these rules/laws. Also, how do you identify if the system is closed/no external forces act upon the system..?

[djemidjma]

Shouldn't both m and v both change for the part b? m goes up and v goes down, but when you were making your final conclusion, you said v goes down, so the energy goes down, but it isn't 100% clear, because m also goes up 3x. So since v is 3x less and m is 3x more, I feel like it's really important to mention that, since v in the equation is squared, the total energy goes down 3x (v goes down, so the energy goes down is not clear enough, v^2 goes down more than m goes up so the energy goes down is clear enough).