Which two forces pull electrons toward the nucleus in an atoma. the speed of the electron and the charges of the proton and electronb. gravity and centrifugal forcec. the charges if the proton and electron and gravity

An astronaut on the moon throws a baseball upward. the astronaut is 6 ft, 6 in. tall, and the initial velocity of the ball is 3030 ft per sec. the height s of the ball in feet is given by the equation s equals negative 2.7 t squared plus 30 t plus 6.5s=−2.7t2+30t+6.5, where t is the number of seconds after the ball was thrown. complete parts a and b.