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    Can someone explain to me how to do part f of this question? I'm not entirely sure what happens when a string goes taut and I need reminding.

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    When Q hits the ground P will be traveling up the slope, then back down it, then it will go taught. After that tension is restored in the string.
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    But what happens when the string goes taut? Which equations do I use?
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    Yes, when Q hits the ground, the string becomes slack so it won't be under the influence of tension. Therefore P will be travelling up the slope the same speed as Q hits the ground, and will eventually stop up the slope, ignoring tension. For particle P, use speed of Q as u, and v=0 and v=u + at to work out the time and I think you multiply it by two since particle P will go up and eventually stop, and then it will go down the slope and string will be taut again.
 
 
 
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Updated: March 28, 2011

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