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# M1 Question - help please

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1. QP
https://3b0a7b1bc87f5381e60f8f717510...%20Edexcel.pdf
MS
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Question 6(c)
Question 5(b)

Can somebody explain what i have to do when the term 'taut' is used in questions like these?

for 5(b) I worked out the initial velocity (which is final velocity of B- i think) and used a = - 9.8g and v = 0 to work out the s value using v^2=u^2 + 2as

I got the answer 0.3m but in the mark scheme it's 0.6m (0.3m x 2) I think it has something to do with the term taut but i don't know.

For 6(c) I'm just completely lost, i was able to answer (a) and (b) correctly but i have no idea how to answer (c).

Can somebody explain what i have to do in both of these questions that use the term taut in them?

Any help is greatly appreciated, thanks!
2. (Original post by Kay Fearn)

Question 6(c)
Question 5(b)

Can somebody explain what i have to do when the term 'taut' is used in questions like these?

for 5(b) I worked out the initial velocity (which is final velocity of B- i think) and used a = - 9.8g and v = 0 to work out the s value using v^2=u^2 + 2as

I got the answer 0.3m but in the mark scheme it's 0.6m (0.3m x 2) I think it has something to do with the term taut but i don't know.

For 6(c) I'm just completely lost, i was able to answer (a) and (b) correctly but i have no idea how to answer (c).

Can somebody explain what i have to do in both of these questions that use the term taut in them?

Any help is greatly appreciated, thanks!
6(c) Taut just means the tension in the string/ropes are >0. Slack means the tension is 0. So probably you're meant to find T in terms of k and then set T > 0. Remember there are two different ropes though and they're both non-zero tension (i.e: taut).

I think in part (b) you find that , so in part (c) you need only solve to find the set of values for k.

5(b) - you found s = 0.3, sure, that's the height of the string, but in this motion, the string is limp - surely you can visualise this, it flies upwards and it's just limp and hence slack, i.e: no tension - it first becomes taut (regains tension) when it falls to its initial height. i.e: moves up 0.3 and then moves down 0.3 for a total of 0.6 metres.
3. (Original post by Zacken)
6(c) Taut just means the tension in the string/ropes are >0. Slack means the tension is 0. So probably you're meant to find T in terms of k and then set T > 0. Remember there are two different ropes though and they're both non-zero tension (i.e: taut).

I think in part (b) you find that , so in part (c) you need only solve to find the set of values for k.

5(b) - you found s = 0.3, sure, that's the height of the string, but in this motion, the string is limp - surely you can visualise this, it flies upwards and it's just limp and hence slack, i.e: no tension - it first becomes taut (regains tension) when it falls to its initial height. i.e: moves up 0.3 and then moves down 0.3 for a total of 0.6 metres.
Thank you so much!
4. (Original post by Kay Fearn)
Thank you so much!
No problem.

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