This doesn't really have anything to do with the particular science
experiments that are discussed here, but I forwarded it to the experts and
hopefully they'll be of a mind to help you out. Although, since you're a
science teacher, maybe it would be a good idea for you to look up those
principles of conservation of momentum and energy and develope an answer
on your own.
> Could you help me figure out this problem. I am a Middle School Teacher
> and one of my students gave it to me, and before I give them my answer,
> I'd like some outside input.
> Imagine a train truck (just a single carriage freewheeling without a
> motor) full of water travelling horizontal, smooth (frictionless) track,
> at constant velocity. There is a leak in the truck and water is pouring
> slowly (at a constant rate) through the hole. What will happen to the
> velocity of the truck? Your answer should refer to the principles of
> conservation of momentum and energy. Please imagine you are writing this
> answer for a highly able grade 9 student.
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