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Deriving formula multiple choice HELP

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1. Okay can someone explain how you are supposed to do these questions because i'm not getting anything close to the answers. What am I doing wrong?
How tf are these only 1 mark 😡😡

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2. (Original post by jessyjellytot14)

Okay can someone explain how you are supposed to do these questions because i'm not getting anything close to the answers. What am I doing wrong?
How tf are these only 1 mark 😡😡

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For Q9, you need

For Q10, you need

3. (Original post by Eimmanuel)
For Q9, you need

For Q10, you need

Okay so for Q9, you substitute the v in 1/2mv2 for 2πfr ? And then then solve?
4. (Original post by jessyjellytot14)
Okay so for Q9, you substitute the v in 1/2mv2 for 2πfr ? And then then solve?
Yes.
5. (Original post by Eimmanuel)
Yes.
It won't let me rep you but thank you
6. (Original post by jessyjellytot14)
It won't let me rep you but thank you

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