# Concept Question

1. Oct 15, 2007

### DJW

Hey, I had a basic conception question about projectile velocity. When a projectile reaches its highest point, does the velocity of the projectile equal 0 or does it equal the initial x velocity? I know that Vy=0 at the highest point of a projectile's trajectory, but I'm not sure about the other component(s). Does this also go for the acceleration of the projectile?

Last edited: Oct 15, 2007
2. Oct 16, 2007

### Kurdt

Staff Emeritus
When a projectile reaches its highest point you are correct in that its y component of velocity is zero. The x component however is unchanged. A projectile will be subject to a constant acceleration due to gravity.

3. Oct 17, 2007

### DJW

Does that mean that the velocity of a projectile at the highest point of its trajectory will be whatever the initial X velocity is?

4. Oct 17, 2007

### qspeechc

Yes. The acceleration is always constant.

5. Oct 17, 2007

### DJW

Thanks.

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