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# A car accelerates... watch

1. A car accelerates uniformly from 5m/s to 20m/s over a distance of 500m.
a. How long does this take?
b. What is the car's acceleration?

Can somebody help me on this? A-Level Physics has been blessed to me with a bad teacher who's not very good at explaining things. Either that or I'm just stupid.

2. Do you know the suvat equations?

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3. s=500m
u=5m/s
v=20m/s
a=?
t=?

s=1/2(u+v)t
t=2s/(u+v)
t=(2x500)/(5+20)
t=40s

v=u+at
a=(v-u)/t
a=(20-5)/40
a=0.375m/s^2

Hope this helps, make sure to get used to the 4 suvat equations (you should get given them for exams)

4. note that these equations only work if the object "accelerates uniformly" so make sure that's included in the question

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