Nuclear fusion requires high temperatures and pressures in order to bring the nuclei close to each other. This is because all nuclei have a charge. What word completes the sentence?

Gravity is pulling an object into the sun. the closer the object gets to the sun, the greater the gravitational force that acts on the object, increasing its acceleration. a line graph plotting the speed of the object against time would have which shape? a: straight line of positive slope b: curved line that slopes upward c: curved line that slopes downward d: straight line of negative slope