What evidence led scientists to develop the theory of plate tectonics

Which object forms when a supergiant runs out of fuel? a red giant a black hole a white dwarf a neutron star

The fact that the total amount of energy in a system remains constant is a(n)

Avolleyball player hit a ball with a mass of 0.25 kg. the average acceleration of the ball is 15.5 m/s². how much force did the volleyball player apply to the ball? 62.0 n 3.87 n 62.0 m/s² 3.87 m/s²