Question

A dynamite blast at a quarry launches a rock straight upward, and 1.9 s later it...

A dynamite blast at a quarry launches a rock straight upward, and 1.9 s later it is rising at a rate of 11 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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