During an experiment, your teacher dropped a tennis ball out the window. The ball hits the ground 3.0 second later. What was the ball's final velocity just before it hit the ground?

Give an example in which the electrical energy changes to light energy

Point charges q1=+2.00μc and q2=−2.00μc are placed at adjacent corners of a square for which the length of each side is 1.50 cm . point a is at the center of the square, and point b is at the empty corner closest to q2. take the electric potential to be zero at a distance far from both charges. part a what is the electric potential at point a due to q1 and q2? express your answer with the appropriate units.

Calculate 9 ∙ 10-5 divided by 3 ∙ 10-9. (box after the "10" in answer is for the