If Keiji is standing on the ground and tosses his hat straight up into the air, what happens to the hat, and what does Keiji see as the hat moves? Provide a very short response.
The hat moves upward, slows down, stops momentarily at the peak of its arc, and then starts to fall back down due to gravity. Keiji sees the hat rise above his head, momentarily stop in mid-air when it reaches its highest point, and then descend back towards him. Gravity acts on the hat throughout its journey, initially opposing the hat's upward motion and eventually pulling it back down to Earth.