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M1: two solutions for t (SUVAT)

Question 9a. I found the solutions for t but how would I know which way it's moving? I've also come across questions where t has two values but only one is correct, how would I decide which one is right?

http://i.imgur.com/SpVkOKy.jpg
http://i.imgur.com/iEm0aoL.jpg
Original post by Nuvertion
Question 9a. I found the solutions for t but how would I know which way it's moving? I've also come across questions where t has two values but only one is correct, how would I decide which one is right?

http://i.imgur.com/SpVkOKy.jpg
http://i.imgur.com/iEm0aoL.jpg


In question 9a, think about what you're doing. You're throwing the particle upwards and then it comes back down again. So it'll be travelling up before it travels down again. So the first time is when it's going up, the second when it's going down.

I'd need to have context for your second question but again, you should be able to work it out from the question. Think about what the particle is doing and use common sense.
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Nuvertion
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Original post by Chlorophile
In question 9a, think about what you're doing. You're throwing the particle upwards and then it comes back down again. So it'll be travelling up before it travels down again. So the first time is when it's going up, the second when it's going down.

I'd need to have context for your second question but again, you should be able to work it out from the question. Think about what the particle is doing and use common sense.


That makes sense, thanks.
Original post by Nuvertion
Question 9a. I found the solutions for t but how would I know which way it's moving? I've also come across questions where t has two values but only one is correct, how would I decide which one is right?

http://i.imgur.com/SpVkOKy.jpg
http://i.imgur.com/iEm0aoL.jpg


when t has two values and one is ignored, it's either one value of t is negative; (that value should be ignored because time can never be negative), or you will be given a specific time interval in question itself (directly or indirectly), then you take the value of t in the time interval given and just ignore the other.

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