You throw a 2.0 kg basketball at the hoop with an initial total energy of 500 J. (neglect air friction on the ball). a) When the ball reaches the top of its arc, what is its total energy? b) When the ball is about to hit the ring, what is its total energy? c) What principle are you demonstrating?

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge, at the position of the second charge, change if the second charge is doubled? a. the field does not change b. the field strength decreases by half. c. the field strength doubles d. the field strength quadruples