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happykiddo
 one year ago
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?
happykiddo
 one year ago
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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happykiddo
 one year ago
Best ResponseYou've already chosen the best response.1I used the formula \[Average Acceleration= \Delta V / \Delta t\]

IrishBoy123
 one year ago
Best ResponseYou've already chosen the best response.1for the whole journey what are \[\Delta V\] \[\Delta t\]

happykiddo
 one year ago
Best ResponseYou've already chosen the best response.1delta V= 13.1m/s  48.9 m/s delta t= 5 s 10s

IrishBoy123
 one year ago
Best ResponseYou've already chosen the best response.1"at a constant rate from zero"

IrishBoy123
 one year ago
Best ResponseYou've already chosen the best response.1"at a constant rate **from zero**"

IrishBoy123
 one year ago
Best ResponseYou've already chosen the best response.1the journey started at t = 0

happykiddo
 one year ago
Best ResponseYou've already chosen the best response.1So are you saying to just use 15 seconds as my "t" value?

IrishBoy123
 one year ago
Best ResponseYou've already chosen the best response.1so does the question :p "What is its average acceleration to the nearest tenth of a m/s2 **during the 15 seconds**"

happykiddo
 one year ago
Best ResponseYou've already chosen the best response.1I've already tried that it gives me 2.4.....not 0.9

IrishBoy123
 one year ago
Best ResponseYou've already chosen the best response.1what speed did the journey start at? what speed did the journey end at?

happykiddo
 one year ago
Best ResponseYou've already chosen the best response.1Alright 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
 one year ago
Best ResponseYou've already chosen the best response.1good job! been there, done that myself :)
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