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July 31, 2014

July 31, 2014

Posted by **Belinda** on Friday, October 21, 2011 at 11:22am.

- Physics - acceleration..need to find velocity -
**Steve**, Friday, October 21, 2011 at 1:14pmIf v=10 when t= -2, and you have negative acceleration, v is decreasing. How can it increase to 44.7? Is there a typo in here somewhere?

- Physics - acceleration..need to find velocity -
**Steve**, Friday, October 21, 2011 at 1:25pmNever mind. I see acceleration is not constant.

However, I get 15.3 m/s. I will have to recheck my math.

- Physics - acceleration..need to find velocity -
**Steve**, Friday, October 21, 2011 at 6:48pmOK. Finally got a moment,

If we assume a linear function for acceleration, and fitting it to the two points, we get

a = -13/6 t + 26/3

v = V_{0}+ 26/3 t - 13/12 t^{2}

v(2) = 10 = V_{0}- 26/3 * 2 - 13/12 * 4

10 = V_{0}-65/3

V_{0}= 95/3

So, now we know

v(t) = 95/3 + 26/3 t - 13/12 t^{2}

v(6) = 95/3 + 26/3 * 6 - 13/12 * 36 = 44 2/3 = 44.7

- Physics - acceleration..need to find velocity -
**Anonymous**, Wednesday, September 4, 2013 at 11:46pmAn autos velocity increases uniformly from 6m/s to20m/s while covering 70m.find the acceleration and the time taken.

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