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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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?

Physics
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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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delta V= 13.1m/s - 48.9 m/s delta t= 5 s- 10s
"at a constant rate from zero"
"at a constant rate **from zero**"
the journey started at t = 0
So are you saying to just use 15 seconds as my "t" value?
yes!
so does the question :p "What is its average acceleration to the nearest tenth of a m/s2 **during the 15 seconds**"
I've already tried that it gives me -2.4.....not 0.9
what speed did the journey start at? what speed did the journey end at?
Alright I got the answer :P , feeling pretty stupid that i used 48.9 m/s as my initial velocity. I appreciate the help. Thanks : )
good job! been there, done that myself :-)

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