Suppose a rock is dropped into a well 4.9 meters deep.a) Determine the amount of time t it takes for the rock to hit the bottom of the well. t =  b) Determine the velocity v of the rock as it is hitting the bottom of the well. v =  c) If the bottom of the well is lined with thick sand so that the rock does not bounce, what is the velocity vf of the rock just after it hits the bottom of the well? vf =

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