A helicopter takes off vertically, with a constant speed v0. While rising, the pilot drops a cigarette butt. The cigarette will
BLUE: Initially rise with speed v0, reduce its speed, come to rest, and then increase its speed as it goes down.
YELLOW: Not go up at all, but will start to gain downwards speed as it drops to the ground.
PINK: Drop to the ground with a constant speed.
(NOTE: You should neglect air friction, as usual. And remember, these questions are being asked of someone watching FROM THE GROUND, at rest)| Physics 2010 home page. | Prof. Pollock's home page. | Physics Dep't | Send me your comments |