Do not answer unless you actually now how to do
a 0.20-kg stone is thrown vertically upward with an initial velocity of 7.5 m/s from a starting point 1.2 m above the ground.
(a) what is the potential energy of the stone at its maximum height relative to the ground?
(b) what is the change in the potential energy of the stone between its launch point and its maximum height?

convex lenses are thicker at the middle. rays of light that pass through the lens are brought closer together (they converge). a convex lens is a converging lens. when parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus.

i believe it is b. what was the cause of the big bang

hope this !

grav force prop 1/r squared 2r all squared is 4rsquared 1/4rsquared quartered

3. dark matter

empty space could also be a simple vacuum