Achild on roller skates pushes off against the wall with a force of 40n. how far must the child push themselves away from the wall (starting from rest), so that his final kinetic energy is 275j?

Two point charges are on the y axis. a 3.90-µc charge is located at y = 1.25 cm, and a -2.4-µc charge is located at y = −1.80 cm. (a) find the total electric potential at the origin. v (b) find the total electric potential at the point whose coordinates are (1.50 cm, 0). v