What is the required spring constant of a spring to have an elastic potential energy of 100 joules when the compressed is 0.10 m

If there was no gravity then their would be no downword force on the football to have it return the the grownd, and if there was no friction (mainly air friction) then there would be no opposing force the stop the ball from moving through the air allowing the ball to travle ∞.

Amicroscope, because these cells are so small that you would not be able to see them, or what they attack without it.

Answerthe distance between the two ends of the galaxy is 150,000 light years;