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August 22, 2014

Homework Help: physics

Posted by shaknocka on Monday, February 7, 2011 at 11:37am.

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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