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jaxreid
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Homework Statement
A speed skater crosses the start line of a straight 200m downhiull course with speed of 30m per second. She accellerated uniformly all the way down taking 5 sec to cover the course - what is her speed at the finish line? I know this should be simple, but just can't get the answer to work out the same as the solution in the paper.
Homework Equations
s = 1/2 (u+v)t
The Attempt at a Solution
200 = 1/2 (30+v)5
200/5 = 1/2(30+v)
40 = 1/2(30+v)
2 x 40 = 30 + v
80 - 30 = v
v = 50m per sec
Answer in book is 45 - HOW?
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