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May 22, 2015

Homework Help: physic

Posted by tish on Wednesday, February 23, 2011 at 5:33pm.

A dynamite blast at a quarry launches a rock straight upward, and 2.0 s later it is rising at a rate of 15 m/s. Assuming air resistance has no effect on the rock, calculate its speed (a) at launch and (b)4.2 s after launch

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