[UCANSEE2]

Let me clarify my last remark.

The difference it would make is that the driver would probably be screaming that last mile or so.

However, it would never get him a 30mph average no matter how fast he dropped.

[imardmd1]

You are quite correct. One would have to have quite a few seconds to drop a mile, and that would cut the average back. I'm estimating about six seconds, neglecting air resistance. When I get home I'll figure it out.

I guess the specification was 15.00000 mph for the first 1.0000 mile uphill. There was no specification as to the downhill grade.

[imardmd1]

Here's another one.

In your physics lab, you are given a very precise barometer, with the task of using it to determine the height of the 15-story building down the street (within, say, a couple of feet), in order to pass the course.

Tell us how you would use the barometer to determine the height.