A dynamite blast at a quarry launches a rock straight
A dynamite blast at a quarry launches a rock straight upward, and 2.3 s later it is rising at a rate of 18 m/s. Assuming air resistance has no effect on the rock, calculate its speed
(a) at launch and
(b) 5.3 s after launch.
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A dynamite blast at a quarry launches a rock straight upward, and 2.3 s later it is rising at a rate of 18 m/s, calculate blast speed at launch
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