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*From*: palmer@sfu.ca (Leigh Palmer)*Date*: Sat, 8 Feb 1997 11:04:17 -0800

Is this correct? Any help would be greatly appreciated. If it is wrong,

could you please tell me where I went wrong?

Dwight, you've got the simpler version of the rocket problem here. The

difficulty you are having arises from the fact that you are not taking

into account the fact that grampa is moving when he spits. Thus the

value of V2 you are using is too high; it should be 4.5 m/s since that

would be the average speed of the lungers with respect to the rest

frame over the duration of this ugly process.

The problem is much more interesting if you don't let the old guy

drink. Then you have the classical rocket problem, a much more

interesting one. Add gravity and your students will be working at

first year university level. Besides, with that fellow's habits I

doubt he would be drinking water anyway. He's probably into the Jim

Beam.

Leigh

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