What causes melting of material under divergent plate boundaries?

For this car, predict the shape of a graph that shows distance (x) versus time (t). note that time is the independent variable and will be on the bottom axis. need asap

Where is the potential energy throughout the loading, cocking, and releasing of the trebuchet?

Which of these has some mechanical energy? a. an atom b. heat inside earth c. a book on a shelf d. the fire from a lit match