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October 1, 2014

October 1, 2014

Posted by **lance** on Saturday, November 1, 2008 at 9:31pm.

60 mi/h to rest, 80 mi/h to rest,80 mi/h to 60 mi/h

- PHYSICS -
**GK**, Sunday, November 2, 2008 at 1:58amVf^2 = Vo^2 + 2ad

0 = Vo^2 + 2ad

Vo^2 = -2ad

At 60 mph:

V^2 = -2ad => a = -V^2/2d

a = (60.0 mi/h)^2 / (2)(0.0231mi)

a = -77901.64 mi/h^2

1 mi/h^2 = 3600 mi/(h*s) (why?)

1 mi/(h*s) = 1609m/(3600s)(1s) = 0.447 m/s^2

a = -21.64 mi/h/s = -9.67 m/s^2

You calculate the acceleration when Vo = 80 mph in a similar fashion.

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