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M1 Help - taut strings? watch

1. 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.

Here.
2. 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.
3. But what happens when the string goes taut? Which equations do I use?
4. 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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