# Evaluating an exponential function that models a real-world situation

Staff Emeritus

## Homework Statement

Suppose that the velocity v(t) (in m/s) of a sky diver falling near the Earth's surface is given by the following exponential function, where time is measured in seconds.

v(t) = 55 (1-e-0.18(t))

Find the initial velocity of the sky diver and the velocity after 6 seconds.

None.

## The Attempt at a Solution

I don't know what e is, so I can't even attempt this. And it's an online course with no book, just an online program we have to use for everything. It doesn't tell me what e is either.

Dick
Homework Helper

## Homework Statement

Suppose that the velocity v(t) (in m/s) of a sky diver falling near the Earth's surface is given by the following exponential function, where time is measured in seconds.

v(t) = 55 (1-e-0.18(t))

Find the initial velocity of the sky diver and the velocity after 6 seconds.

None.

## The Attempt at a Solution

I don't know what e is, so I can't even attempt this. And it's an online course with no book, just an online program we have to use for everything. It doesn't tell me what e is either.

e is Euler's number. http://en.wikipedia.org/wiki/E_(mathematical_constant)

Staff Emeritus
Dick
Homework Helper
Thanks. I couldn't even find e in the 'dictionary' part of the program. You'd think they'd give it to you if you have to use it...

Yes, they probably should. Though it's kind of standard.

SteamKing
Staff Emeritus