A dynamite blast at a quarry launches a rock straight upward, and 1.6 s later it...
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) 6.0 s after launch.
Homework Answers
(a) Calculate its speed at launch
Let initial velocity be 
Given that the rock is rising at a rate of 19 m/s at 1.6 s later after the blast.
Use formula 
(a) ANSWER :
=================
(b) Calculate speed 6.0 s after launch.
Use formula
(b)ANSWER :
=====================
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