What percent of the total solar wind energy density is due to the imf at the earth's magnetopause position? use bimf= 5nt, n= 10-6m-3,usw= 400 km/sec.

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 ∞.

Velocity is the speed of an object in a certain direction so you'd need to know speed and direction

The sun's gravitational pull is weaker on the planets that are closer to it, i think.