A 500 g ball moves in a vertical circle on a 102 cm long string. The speed at the top is 4 m/s. What is the speed at the bottom? (think conservation of energy)

There is no graph to look at on here, but i shall explain them to you. a line graph is just in its title it’s a graph with a line running through the dots to show an increase or decrease. a bar graph is used to show how much or how little something is so a comparison. a scatter plot is used to graph points to tell the data. and i don’t know what a histogram is.