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How to solve speed if is km and is minutes


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1.I'm stuck on this problem regarding finding the speed of a cart moving down and then up a slope from ...

rest. The current unit that our teacher has us on so far is centripetal motion, and I can't recall being taught how to solve this. File attached below shows my work so far, I don't necessarily need the work done for me, but I just want to be put on the right track, such as an equation to start with or what I need to look for. The answer I got was clearly incorrect for part a (which is what I need help with), so please help me get going in the right direction.
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4.I am stuck on a calculus related rates problem, it has been driving me crazy since Friday and since it ...

it is Reading Break I am doubtful that I can contact my teacher before I need to know how to solve this. The following is the question: A light shines from the top of a pole that is 20 meters high. A ball is falling 10 meters away from the pole, casting a shadow on a building that is 30 meters away. When the ball is 25 meters from the ground it is falling at a speed of 6 meters per second. How fast is the shadow moving? Side note: from left to right are the following, lamp, ball, wall with shadow.
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1.AU MAT 120 Systems of Linear Equations and Inequalities Discussion

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