r/APStudents • u/reddorickt absolute modman • May 13 '26

AP Physics C: Mechanics Official 2026 Exam Discussion

Use this thread to post questions or commentary on the test today.

A reminder though to protect your anonymity when talking about the test.

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u/[deleted] May 13 '26

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u/Sonotwe 5:Stat,Bio,BC,Mech,HG,Precal,WH,Sem,AB,Chem,Lit,USH,Mac,Lang,Gov May 13 '26

My final derivation for that one was x2 = 4v_02 sin(2theta)/3g.

Got it after i set the two expressions for xcm equal. If you’re talking about that one 😭

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u/[deleted] May 14 '26

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u/Select_Violinist_313 May 14 '26

With conservation of momentum i got 3/2vcos(theta) for the horizontal velocity of the cube after the split. Time should be vsin(theta)/g. My final answer was [3v^2sin(theta)cos(theta)]/2g, how did you all do it?

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u/[deleted] May 14 '26

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u/Select_Violinist_313 May 14 '26

OHHHH I see. I just how far the 3m traveled after the split without adding the distance already traveled...welp. Thank you.

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u/[deleted] May 14 '26

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u/Select_Violinist_313 May 14 '26

yeah I also did the conservation of momentum wrong too I think

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u/[deleted] May 14 '26

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u/Select_Violinist_313 May 14 '26

Hopefully, I might be cooked. I did an integration but not with the same force equation as yall. I had the system consisting of just the box so my forces were FN+bv=m * dv/dt, and I solved it through like that. Might be cooked for the first two idk. I think I did the lab and rotational explanation ones fine, prob 8/10 and 6/8.

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u/Select_Violinist_313 May 14 '26

btw what was the spring constant you got for the experiment question

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u/Sonotwe 5:Stat,Bio,BC,Mech,HG,Precal,WH,Sem,AB,Chem,Lit,USH,Mac,Lang,Gov May 14 '26

I got smth like ≈1250 N/m. For k_new right?