Two identical balls collide one was initially at rest. after the collision one of the balls has a velocity of 3 m/s south. the other has a velocity of 4 m/s west. what was the velocity of the ball that was moving before the collision

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.

Place several e-field sensors at a few points on different equipotential lines, and look at the relationship between the electric field and the equipotential lines. which statement is true? 1-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of higher voltages. 2-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of lower voltages. 3-at any point, the electric field is parallel to the equipotential line at that point.