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Ch 02: Motion Along a Straight Line
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All textbooksYoung & Freedman Calc 14th EditionCh 02: Motion Along a Straight LineProblem 2

Chapter 2, Problem 2

A large boulder is ejected vertically upward from a volcano with an initial speed of 40.0 m/s. Ignore air resistance. (e) What are the magnitude and direction of the acceleration while the boulder is (i) moving upward? (ii) Moving downward? (iii) At the highest point?

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Welcome back everybody. We have a rock that is thrown straight upward which I will its motion with this arrow and ignoring wind resistance, it is going to come straight back down. Now we are tasked to find what the acceleration is on the rock when it is going up. But the acceleration on the rock is when it is going down and the acceleration on the rock when it is at the top. Now here's the thing for this rock, there is no wind resistance, meaning that this rock is in what we call re All meaning the acceleration acting on the rock is the acceleration due to gravity, which we denote by negative 9. meters per second squared. Now, where is this acceleration on the rock? While this acceleration is acting on the rock? At every single point, the acceleration due to gravity is always going to be pulling the rock downward, meaning that our answers for Part one is equal to answer Part two. Equal to answer Part three, Which means that it's equal to negative 9.8 m/s squared which is our acceleration at all times corresponding to answer choice. C Thank you guys so much for watching. Hope this video helped and we will see you all in the next one
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A large boulder is ejected vertically upward from a volcano with an initial speed of 40.0 m/s. Ignore air resistance. (b) At what time is it moving at 20.0 m/s downward?
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