# Homework Help: Air Resistance project

1. Nov 21, 2009

### hallowon

1. The problem statement, all variables and given/known data
I'm trying to program a projectile motion program for my physics project. We are suppose to take account effects on air resistnace
If our drag coefficient is 0.4 our mass is 0.14273kg(baseball) initial velocity is 20, and angle is 45. What would be the acceleration of x component and y component
2. Relevant equations

3. The attempt at a solution

When i did ax=Fairx/mass i have a number in the 500's my ay= (fg+fairy)/m is really huge too:/

WHne i say huge i mean hundreds huge. All i'm asking is is -550m/s^2 a normal acceleration due to air resistance >.>

Last edited: Nov 21, 2009
2. Nov 21, 2009

### ideasrule

It definitely isn't normal. How did you calculate Fair? It should be Cd*rho*A*v^2.

3. Nov 21, 2009

### hallowon

for just Fair it is kv^2

where k is initial velocity.(20) and k is 0.4(our given drag)

4. Nov 22, 2009

### Redbelly98

Staff Emeritus
Can you look up how drag coefficient is defined, either in your textbook or lecture notes? I think you are not using it correctly here.