an object is released from rest high above the surface of the earth. when it has fallen halfway to the surface, its kinetic energy is . after it has fallen twice as far, just before it hits the surface of the earth, its kinetic energy is .

The smokey mountains have over 2,100 miles of rushing mountain streams and rivers that flow through the park. in each mile lives a diverse community of native fish, amphibians, insects, and larvae, some of which are found only in the southern appalachians. park managers and scientific researchers test many factors such as fish populations, the watersheds and water tests to determine a) too many lizards are present b) the water quality of the stream c) rainwater is running into local streams d) if visitors to the park are overstaying their welcome