1) A ball hits the ground and bounces back up. We can say (2pts) O we do not have enough information to choose an answer. its velocity has not changed O its velocity has changed. O its acceleration is zero because its speed has not changed. 2) A ball is going East and getting faster as it goes. Its acceleration (2pts) is West O East O its acceleration has to be decreasing. O Here the acceleration is increasing: 3) The presence of air resistance as an object falls means the acceleration of the object is greater than 9.8m/sec^2 0 9.8m/5^2 O less than 9.8m/5^2 O om/512 4) The gravitational force with which the earth attracts the moon (2pts) varies with the phase of the moon is more than the force with which the moon attracts the earth is less than the force with which the moon attracts the earth O is the same as the force with which the moon attracts the earth 5) Which one of the following is a vector? (2pts) number of phone users in a classroom speed velocity mass