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# Maths problem watch

1. Really stuck on this one, any help would be much appreciated.

A .

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2. s = ut + 1/2.at^2

s = 450, t = 10, u = 0, a = ?

450 = (0 x 10) + 1/2.a.10^2

Solve for a.

P.S. Giving you the mass of the car is a curved-ball; you don't need it to answer this question.
3. Ok, I get it now! Now I feel like an idiot on how simple it actually is

Thanks!

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4. (Original post by VannR)

P.S. Giving you the mass of the car is a curved-ball; you don't need it to answer this question.
Yeah, one of the reasons why I was so confused on if I was on the right track or not.

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5. (Original post by goodwinning)
Yeah, one of the reasons why I was so confused on if I was on the right track or not.

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Same here! Took me a couple of minutes to realise it as well.
6. Just had a look at my notes and it says this has to be solved using simultaneous equations😓

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7. (Original post by goodwinning)
Just had a look at my notes and it says this has to be solved using simultaneous equations😓

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Simultaneous equations:

Using v = u + at:

v = 0 + 10a = 10a

Subst v in s = vt - 1/2.a.t^2:

450 = 100a - 50a
a = 450/50 = 9ms^-2

The original way:

Using s = ut + 1/2.a/t^2:

450 = 0 + 50a
a = 450/50 = 9ms^-2

It works out the same; it's obvious which method is better, though.
8. Thanks

Yeah, the 1st method makes more sense but for my course you have to use simultaneous equations on this particular assignment which is annoying.

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