A dynamite blast at a quarry launches a rock straight


A dynamite blast at a quarry launches a rock straight upward, and 2.4 second later it is raising at a rate of 12 m/s. Suppose air resistance has no effect on the rock, evaluate its speed

(a) at launch and

(b) 5.8 second after launch.

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