What is the slope of the line plotted below?

Ineed the answer to question 1 , i’m desperate

A0.580-kg rock is tied to the end of a string and is swung in a circle with a radius of 0.500 meters. the velocity of the rock is 4.50 m/s. what is the centripetal force acting on the rock? 15.5 n 5.22 n 69.8 n 23.5 n

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