Answer:
The mantle exists above the crust of the earth
During the fall, all the initial potential energy of the rock

has converted into kinetic energy of motion

where h is the initial height of the rock, m its mass, and v its velocity just before hitting the water. So, for energy conservation, we have

and so we can find the value of K, the kinetic energy of the rock just before hitting the ground:
High frequency for the range of radio frequency electronmagnetic waves between 3 and 30 megahertz (MHz)