- Thread starter masterazn
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This assumes that the haystack applies a constant resistive force and not like a spring. [edit] (this won't matter so nvm)

man, late night math seems so much harder - i wonder if i should sleep now or just stay awake all night and sleep after my moring classes

Kinetic Energy: 1/2MassxVelocity^2

PE determines maximum KE for a given move. Doubling the height, all other factors equal, would double the PE.

ForcexDistance= Work, in which case. The car itself isn't really doing any, as it's just relying on gravity.

Eh. Someone pick up from there.

v(final)^2 = v(initial)^2 + 2*a*d. where v is velocity, a is accelortion and d is displacement. with this equation you will see that doubling the displacment will quadruple the speed thus quadrupling the force bringing the car four times further through the haystack.

and anyway, if they haystack provides a constant force, the distance increases by sqrt 2. if it's like a spring then it's still sqrt2 for different reasons. if it's similar to air resistance or something different it's a lot harder. the question doesn't specify the equations of the haystack do they?

First, state the the first hill was so high that the car reached terminal velocity before it hit the haystack. (this means its going as fast as natural gravity will allow it)

Thus, no matter how high the second hill is, the car will be travelling at the same speed as before upon entering the haystack. So, it will go the same distnance into the stack.

Its nice that everyone else is tossing all these formulas around, but just keep it simple and state your assumptions. Since they dont give you an initial hill height, you can assume it to be anything, and be right.

You get a 40 foot hill, that has a distance of, I dunno, 90 feet. You double the height of the hill, thus increasing the length of the hill (since it will be at an angle?) and then you get 80 ft and 180 ft. Regardless of how fast you go, you will still travel 180 ft, correct?

This question seems too vague as it's not really asking for specifics, and to be honest I don't believe the haystack has anything to do with the problem at all. I say make up a solution for distance, speed, and time each, and then ask the professor what kind of drugs he was using when he made such a crappy question?

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