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## Homework Statement

I have to make a plot. This plot must illustrates a position of a ball, which is falling. My problem is that I dont know what v is in this equation.

drag force= -C * ||v(t)|| * v

## Homework Equations

To calculate the velocity:

v(t+dt)=v(t)+a(t)*dt

where t is time and dt is Δt

The position:

x(t+dt)=x(t)+v(t)*dt

To find a(t) (the acceleration) I use:

a(t)=F(t)/M

where M is the mass f the ball and F(t):

F(t)=force from gravity + drag force

And drag force is:

drag force= -C * ||v(t)|| * v

## The Attempt at a Solution

I have discussed it with some from my class and some say v is v(t-dt) .. other say it is just v(t).