- #1

armolinasf

- 196

- 0

## Homework Statement

I'm having a bit of difficulty with these two integration problems:

1. Suppose [tex]\int^{2}_{0}[/tex]f(t)dt=3 calculate the following:

a) [tex]\int^{.5}_{0}[/tex]f(2t)dt

b) [tex]\int^{1}_{0}[/tex]f(1-t)dt

c) [tex]\int^{1.5}_{1}[/tex]f(3-2t)dt

The second problem is this:

If we assume that wind resistance is proportional to velocity, then the downward velocity, v, of a body of mass m falling vertically is given by:

v=(mg/k)(1-e[tex]^{(-kt)/m}[/tex])

where g is the acceleration due to gravity and k is a constant. Find the height, h, above the surface of the earth as a dunction of time. Assume the body starts at height h[tex]_{0}[/tex]

## The Attempt at a Solution

For 1, I know that there is some sort of substitution that I'm just not seeing.

For 2, I basically treated it like a differential equation where v=dh/dt and I get as an antiderivative: (mg/k)(t-(m/k)e[tex]^{(k/m)t}[/tex]

I'm not sure how to get the height equal to 0 so that I can incorporate the h[tex]_{0}[/tex]

Any help is appreciated