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Circular motion help

Have been doing this question but stuck on how to part c)ii

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These are my workings so far

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Any help would be amazing! Thanks

EDIT: Nevermind I think I figured it out. I remember getting a similar question like this but forgot how to do the steps

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(edited 4 years ago)
Alternative solution here using the centripetal force equation instead of Newton's second law. Gives you the velocity to chuck into ciii) straight away.
circularmotionsolution.jpg508.1KB

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