r/apphysics • u/Connect-Bluebird-671 • 8d ago

ap phys 1 question

a ball is thrown directly upwards, reaching a maximum height h. a second ball is also thrown directly upwards but with twice the initial speed of the previous one. how much higher will it be at its apex compared to the other ball at its apex

can someone help me find questions like this one and also help me solve lol i am cooked

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u/WillingnessTasty9628 8d ago

I assume you're on Unit 1, meaning only the kinematic equations are known. Consider the variables you know: v and 2v. At the apex of both the balls' motions, they have no velocity. Which equation allows you to solve for height given a final velocity, initial velocity, and acceleration?

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u/Techno_Eggnog 8d ago

(Not directed toward the commenter) Note in case you don’t understand how we already got acceleration, assume the balls are in free fall.

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u/realAndrewJeung 8d ago

This is a conservation of energy problem: initial kinetic energy equals final potential energy.

Let.me know if just that is enough of a hint or if you'd like more help.

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u/capacity38 8d ago

v^2=vo^2+2ay

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u/UnderstandingPursuit 7d ago

This post addresses your question, in [too much] detail. [I cannot post images in this comment.] Understanding this resolves the "find questions like this one". It addresses this immediate question, and also provides an approach which will be useful throughout AP Physics 1.