The graph plots a cyclist’s speed over a $30$ second journey. The vertical axis is labelled Speed (m/s), while the horizontal axis is Time (seconds).
(a)[1]
Write down the cyclist’s acceleration between $15$ seconds and $25$ seconds.
(b)[2]
Using a tangent, find an estimate for the cyclist’s acceleration at $7.5$ seconds.
(c)[3]
Work out the cyclist’s average speed between $15$ seconds and $30$ seconds.
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