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M2 projectiles watch

1. Tried this question several times and I keep getting the same-wrong- answers for part a

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2. (Original post by drandy76)
Tried this question several times and I keep getting the same-wrong- answers for part a

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What do you have so far?

We know that, horizontally: and that vertically we have:

So: , you know that

which, after plugging into the equation should let you solve for .
3. (Original post by Zacken)
What do you have so far?

We know that, horizontally: and that vertically we have:

So: , you know that

which, after plugging into the equation should let you solve for .
Ive been using Vt= 30/cos(25) and subbing the value given into the y equation to solve for t, and hence V, which i got as 15.6, i also tried using the equation of trajectory and got the same answer
4. (Original post by drandy76)
Ive been using Vt= 30/cos(25) and subbing the value given into the y equation to solve for t, and hence V, which i got as 15.6, i also tried using the equation of trajectory and got the same answer
Would the answer happen to be something close to 22.1 ish?
5. (Original post by Zacken)
Would the answer happen to be something close to 22.1 ish?
6. (Original post by drandy76)
Mind posting your working so I can see where you're going wrong?
7. (Original post by Zacken)
Mind posting your working so I can see where you're going wrong?
this is where I'm at ATM
and this was my previous attempt

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8. (Original post by drandy76)
this is where I'm at ATM
and this was my previous attempt

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Remember that your has , there's no there since the 's cancel.
9. (Original post by drandy76)
and this was my previous attempt

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This is all correct up till then multiply both sides by 2 and divide by so whilst you've got 4 for some reason.
10. (Original post by Zacken)
Remember that your has , there's no there since the 's cancel.
Thanks i finally got it:^_^:, it started to look similar to one of (many) failed working, after looking back i didnt multiply 3 by v^2 initially
11. (Original post by drandy76)
Thanks i finally got it:^_^:, it started to look similar to one of (many) failed working, after looking back i didnt multiply 3 by v^2 initially
Awesome. See my reply to why your other method with finding t didn't work either.
12. apparently i decided it was appropriate to divide by 4.9 even after multiplying both sides by 2, Mechanics is preventing from even doing basic math
(Original post by Zacken)
Awesome. See my reply to why your other method with finding t didn't work either.
13. (Original post by drandy76)
apparently i decided it was appropriate to divide by 4.9 even after multiplying both sides by 2, Mechanics is preventing from even doing basic math
Happens to all of us, glad it's sorted now. :-)
14. I saw Zacken doing some Mechanics!!
15. (Original post by TeeEm)
I saw Zacken doing some Mechanics!!
Never again.
16. (Original post by Zacken)
Never again.
you should try more often
17. (Original post by TeeEm)
you should try more often
I agree, I like mechanics, I'm just not very good at it, I'll work on it sometime
18. (Original post by Zacken)
I agree, I like mechanics, I'm just not very good at it, I'll work on it sometime
less time here ...!
(mind you if you end up at Warwick you will not be doing any .... Just Pure and Stats)
19. (Original post by Zacken)
I agree, I like mechanics, I'm just not very good at it, I'll work on it sometime
I love how TeeEm keeps insinuating that you're going to Warwick - such great banter
20. (Original post by TeeEm)
I saw Zacken doing some Mechanics!!
Good games yesterday....

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