# Homework Help: Air resistance and projectile help

1. May 16, 2007

### reza

if we lunch a projectile with the act of air resistance which t (time) is longer
t1 =>from t=0 to arriving to the highest point
t2=> from highest point to the lanch point

2. May 16, 2007

### go quantum!

You tell me. Choose two points at the same height of the trajectory. Compare their velocities. This should be a great hint.

3. May 18, 2007

### reza

my problem is velocity i dont know how air rsistance affects on velocity?

4. May 18, 2007

### Office_Shredder

Staff Emeritus
Air resistance slows things down. That should be enough information

5. May 20, 2007

### perfectz

If there is no air resistance(assumption), then?

6. May 20, 2007

### fffff

Consider the forces when a particle is thrown upwards.
And the forces then it is going downeards.

7. May 20, 2007

### DyslexicHobo

In case you didn't know... Fair = -kv, where k is some constant. This means that the faster the ball is going, more air resistance is acting.

8. May 22, 2007

### reza

then t1=t2? right?