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I need to know how to work this one enter image description here

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closed as off-topic by LonelyProf, alephzero, Bill N, Kyle Kanos, Gert Jan 14 at 15:34

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Homework-like questions should ask about a specific physics concept and show some effort to work through the problem. We want our questions to be useful to the broader community, and to future users. See our meta site for more guidance on how to edit your question to make it better" – LonelyProf, alephzero, Bill N, Kyle Kanos, Gert
If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ Welcome to Physics SE! Please note that this is not a homework help site. Do take a moment to read our advice on what is on-topic and off-topic here, and our policy on homework questions. $\endgroup$ – LonelyProf Jan 14 at 14:40
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    $\begingroup$ Please show us what you have tried. $\endgroup$ – WarreG Jan 14 at 14:48
  • $\begingroup$ Why did you put the tag "statistical-mechanics"? Please use correct tags. $\endgroup$ – harshit54 Jan 14 at 15:03
  • $\begingroup$ @harshit54 I just edited the tag for you ;) $\endgroup$ – alephzero Jan 14 at 15:04
  • $\begingroup$ Draw free-body diagrams, write Newton's 2nd Law equations, make the tangential accelerations equal. and boom, there it is. $\endgroup$ – Bill N Jan 14 at 15:11