Two balls, projected at different times so they don't collide, have trajectories A and B, as shown below. Which statement is correct? A) v_0B must be greater than v_0A. B) Ball A is in the air for a longer time than ball B. C) Ball B is in the air for a longer time than ball A. D) Ball B has a greater acceleration than ball A. E) Ball A has a greater acceleration than ball B.

Question

Quizplus · Accepted Answer

Ball B is projected at a higher velocity than Ball A, which causes it to cover more distance in the same amount of time, and as a result, stays in the air for a longer time than Ball A. Velocity and acceleration cannot be compared as they are vectors with both magnitude and direction, whereas we only have access to the magnitude of the acceleration and velocity in this particular question.

Two Balls, Projected at Different Times So They Don't Collide