moz4rt
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For part c we know the velocity of the particle when the string becomes slack but if I use suvat equations I don't get the correct answer, why is this?
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old_engineer
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(Original post by moz4rt)
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For part c we know the velocity of the particle when the string becomes slack but if I use suvat equations I don't get the correct answer, why is this?
You can use SUVAT as long as you remember that the particle has already moved l/2 before the SUVAT starts, and that you must add that l/2 to your SUVAT answer. Post your working if struggling.
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Anonymouspsych
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(Original post by moz4rt)
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For part c we know the velocity of the particle when the string becomes slack but if I use suvat equations I don't get the correct answer, why is this?
I wouldn't recommend using Suvat because the tension in the string will vary and hence the resultant force and accleration will vary. Try using an energy method

EDIT: Yes you can use suvat but only after the string is slack
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moz4rt
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Is the force acting in the opposite direction to motion mg/2 so the equation v^2=u^2+2as becomes gl/4=mgs, but the distance shouldn't be in terms of m
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moz4rt
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ahah nvm lol a=F/m
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