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## Homework Statement

Looking for F for 200 km/hr

## Homework Equations

F=ma

## The Attempt at a Solution

F-cv^2 = ma

F= ma +cv^2

v=200 km/hr

F= ma +c(200 km/hr)^2

so now I need to find a, from previous work I found that

t= (m/c)*(1/2 vter)*(ln[ (vter +v)/(vter-v)])

next I would solve for v and take the derivate to get a.

but I know that

v^2 =v0^2+2a( x -x0)

where

a= v^2-v0^2 / 2(x-x0)

I know that v=2000 km/ hr

v0=0 since it was at rest

x= final distance

x0=0 since it starts at the origin

#### Attachments

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