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Q. A dynamite blast at a quarry launches a chunk of rock straight upward, and 1.6 s later it is rising at a speed of 20 m/s. Assuming air resistance has no effect on the rock, calculate its speed at (a) at launch and (b) 5.5 s after the launch.

Q. A stone is dropped from the top of a cliff at t=0. The splash it makes when striking the water below is heard 6 seconds after it is dropped (i.e. at t=6 sec). How high is the cliff? (i.e. find 'h') Assume that the speed of sound in air is 340m/s and g = 9.8 m/s2.

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