Two balls having different masses reach the same height when shot into the air from
the ground. if there is no air resistance, which of the following statements must be
true? (more than one statement may be true.)
(a) both balls left the ground with the same speed.
(b) both balls left the ground with the same kinetic energy.(c) both balls will have the same gravitational potential energy at the highest point.
(d) the heavier ball must have left the ground with a greater speed than the lighter
ball.
(e) both balls have no acceleration at their highest point.