I place a ball on a 6 meter ramp that is 4 meters tall and 5 meters long. Draw a force diagram of the ball rolling down the ramp at the half way point. Draw a motion map of the ball's trip down the ramp. Use any reasoning or equations or graphs to give me your best guess on how fast that ball will be moving at the bottom of the ramp.

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.