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# calculus in kinematics

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1. For Q13c), I got times as 2 and -2/7, whereas the answer in the book gives both values as positive. Is this a mistake on my part?
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2. (Original post by pippabethan)
For Q13c), I got times as 2 and -2/7, whereas the answer in the book gives both values as positive. Is this a mistake on my part?
Haven't worked through it, but you should be able to recognise that a negative value of t is usually incorrect
3. (Original post by pippabethan)
For Q13c), I got times as 2 and -2/7, whereas the answer in the book gives both values as positive. Is this a mistake on my part?
Can you show us your working? I have a good hunch of where the sign slip comes from but I'd need to see your working to confirm it.
4. (Original post by Zacken)
Can you show us your working? I have a good hunch of where the sign slip comes from but I'd need to see your working to confirm it.
It should be attached alongside the question?
5. (Original post by pippabethan)
It should be attached alongside the question?
Officially confirmed as blind. Apologies, will have a look now,
6. (Original post by pippabethan)
It should be attached alongside the question?
Okay, yeah - I agree with you in that it should be or (although I feel like I'm missing something...) but you can't have negative time, so you need to throw the latter answer away.
7. (Original post by Zacken)
Okay, yeah - I agree with you in that it should be or (although I feel like I'm missing something...) but you can't have negative time, so you need to throw the latter answer away.
So there's only the answer corresponding to t=2 for part d?
8. (Original post by pippabethan)
So there's only the answer corresponding to t=2 for part d?
I'm fairly sure, I might be missing something, though.
9. (Original post by Zacken)
I'm fairly sure, I might be missing something, though.
Okay, thank you!!
10. (Original post by pippabethan)
Okay, thank you!!
If I'm wrong, I'm sure somebody like Ghostwalker will jump in and remedy it in due course. I don't think so, though.

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