Three balls of equal mass are fired simultaneously with equal speeds from the same height h above the ground. Ball 1 is fired straight up, ball 2 is fired straight down, and ball 3 is fired horizontally.
Rank in order from largest to smallest the speeds of the balls, v1, v2, and v3, just before each ball hits the ground.

a) v1 > v2 > v3
b) v3 > v2 > v1
c) v2 > v3 > v1
d) v1 = v2 = v3

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.