A dynamite blast at a quarry launches a rock straight


A dynamite blast at a quarry launches a rock straight upward, and 1.9 s later it is rising at a rate of 18 m/s. assuming air resistance has no effect on the rock, compute its speed (a) at launch and (b) 4.6 s after launch.

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Physics: A dynamite blast at a quarry launches a rock straight
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