4. If you fall out of a plane and point your head down, it would take about 5 s to reach a velocity of 49.1 m/s downward. What is the acceleration of gravity?

Four objects each with charge +2.0×10−7c are located at the corners of a square whose sides are 2.0 m long. part a what quantities can be determined using this information? check all that apply. the electric force on a charged object placed at the center of the square. the mass of each object. the total electric potential energy of the system consisting of the four charged objects. part b find the electric force on a charged object placed at the center of the square.