happykiddo
  • happykiddo
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
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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happykiddo
  • happykiddo
I used the formula \[Average Acceleration= \Delta V / \Delta t\]
IrishBoy123
  • IrishBoy123
for the whole journey what are \[\Delta V\] \[\Delta t\]
IrishBoy123
  • IrishBoy123
*whole* journey

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More answers

happykiddo
  • happykiddo
delta V= 13.1m/s - 48.9 m/s delta t= 5 s- 10s
IrishBoy123
  • IrishBoy123
"at a constant rate from zero"
IrishBoy123
  • IrishBoy123
"at a constant rate **from zero**"
IrishBoy123
  • IrishBoy123
the journey started at t = 0
happykiddo
  • happykiddo
So are you saying to just use 15 seconds as my "t" value?
IrishBoy123
  • IrishBoy123
yes!
IrishBoy123
  • IrishBoy123
so does the question :p "What is its average acceleration to the nearest tenth of a m/s2 **during the 15 seconds**"
happykiddo
  • happykiddo
I've already tried that it gives me -2.4.....not 0.9
IrishBoy123
  • IrishBoy123
what speed did the journey start at? what speed did the journey end at?
happykiddo
  • happykiddo
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 : )
IrishBoy123
  • IrishBoy123
good job! been there, done that myself :-)

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