URGENT HELP:::A car accelerates at a constant rate from zero to 48.9 m/s in 10 seconds and then slows to 13.1 m/s in 5 seconds. What is its average acceleration to the nearest tenth of a m/s2 during the 15 seconds?
The answer is 0.9, WHY?

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I used the formula
\[Average Acceleration= \Delta V / \Delta t\]

for the whole journey what are
\[\Delta V\]
\[\Delta t\]

*whole* journey

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