anonymous
  • anonymous
a car is traveling in a straight line and decelerating at a constant rate. after 3.2 seconds it has traveled 88m and slowed to a speed of 27 m/s what is the initial speed i got 52 m/s
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
\[v^2-2as=u^2\]
perl
  • perl
what does s and u stand for?
anonymous
  • anonymous
Put \[a=\frac{v-u}{t}\]

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anonymous
  • anonymous
s distance u initial velocity
anonymous
  • anonymous
and the plug a back into the equation that is what i did but im not sure if my math is right
anonymous
  • anonymous
other people had like 97m/s which didnt make sense to me
perl
  • perl
v is final velocity, u is initial velocity
anonymous
  • anonymous
Better use \[s=ut+\frac{1}{2}at^2\]
perl
  • perl
so youre using kinematic equations under the assumption that acceleration is constant
perl
  • perl
might as well write them all out :)
anonymous
  • anonymous
Help me
perl
  • perl
youre doing good
perl
  • perl
there are 4 kinematic equations under constant acceleration
anonymous
  • anonymous
Gotto go i told everything would need to do this problem
anonymous
  • anonymous
i used x=xknot+vknot(t)+.5a(t)^2 where x= position, v=velocity a=acceleration and t= time
anonymous
  • anonymous
i solved for and the plugged it into v=vknot+a(t) and solved for vknot
anonymous
  • anonymous
|dw:1328860422815:dw|

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