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                 Projectiles 
                
                  A woman holds two cannonballs that weigh the same. Both will
                  leave her hands at the same time, but this time she'll drop
                  one and push the other away from the tower. She'll be careful
                  to push the ball in a direction that is parallel to the
                  ground.
                 
                What do you think will happen? 
                
                  - 
                    
                      the ball that falls straight down will reach the ground
                        first
                     
                   
                  - 
                    
                      both balls will reach the ground at the same time
                     
                   
                  - 
                    
                      the ball that is thrown horizontally will reach the
                        ground first
                     
                   
                 
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