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A dynamite blast at a quarry launches a rock straight upward, and 1.6 s later it is rising at a rate of 19 m/s. Assuming

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A dynamite blast at a quarry launches a rock straight upward, and 1.6 s later it is rising at a rate of 19 m/s. Assuming air resistance has no effect on the rock, calculate its speed (a) at launch and (b) 4.9 s after launch. (a) Number i ! Units m/s (b)Number i ! Units m/s

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