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Q. A stone is dropped from the top of the cliff. The splash it makes when striking the water below is heard 3.5 seconds after it is dropped. How high is the cliff? Presume that the speed of sound in air is 343 m/s and g = 9.8 m/s2.

Q. Presume, for example, that the track has a radius of 2.40 m and that the driver goes past point 1 at the bottom with a speed of 18.00 m/s. What speed must she have at point 3, so that the normal force at the top has the same magnitude as it did at the bottom?

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