Asolid disk is released from rest and rolls without slipping down an inclined plane that makes an angle of 25.0 degrees with the horizontal. what's the speed of the disk after is has rolled 3.00m, measured along the plane?

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.