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1. January 2010 question 2iv

How are they working this out? What formula are they using
Is it just simple v=u+at

https://e3ab10733179873e9fd16d54c56b...%20A-level.pdf
2. (Original post by Acrux)
January 2010 question 2iv

How are they working this out? What formula are they using
Is it just simple v=u+at

https://e3ab10733179873e9fd16d54c56b...%20A-level.pdf
It's . When the acceleration is variable, v=u + at doesn't necessarily hold, but you can replace a by and the equation works. denotes the average acceleration between 0 and t.

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