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September 18, 2014

September 18, 2014

Posted by **anonymous** on Tuesday, February 15, 2011 at 11:46pm.

- physics -
**drwls**, Wednesday, February 16, 2011 at 12:52amIf the average must be 21,

(V1 + V2)/2 = 21

V1 + V2 = 42

V2 = 42 - V1 = 42 - 6 = ___ mph

V2 is the final velocity required

V1 is the initial velocity

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