posted by andrea .
Two balls having different masses reach the same height when shot into the air from the ground.
If there is no air drag, 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.
A. is true if the balls were thrown at the same angle. That should have been specified.
None of the other ststements are true.
The acceleration is always -g for both, while in the air.