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jisalinas5576
30.10.2020 •
Physics
A car slams on its brakes creating an acceleration of -3.2 m/s². It comes to rest after traveling a distance of 210 m. What was its velocity before it began to accelerate?
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Ответ:
36.66m/s
Explanation:
Listing everything is gives you:
Vf = 0
a = -3.2
Δx = 210
Vi = ?
Pick one of the kinematic equations to find the missing variable
I used this one:
Δx
When you plug everything in, you get
0 =![Vi^2 -1344](/tpl/images/0854/1682/12ecb.png)
add 1344 to both sides and square root to get Vi = 36.66
Ответ:
i think the answer is a, hope this is right, that would be my best guess.