speed vs velocity vs acceleration

any thoughts will be helpful,again

thanx

To a mathematician or a physicist, the difference between speed and velocity is that SPEED is strictly a number ("His speed at the moment of impact was 72 km/h") whereas VELOCITY is a vector quantity, with both a number and a direction ("His velocity was 72 km/h due east").

In informal language the two words are used interchangeably.

Acceleration is the rate at which speed or velocity is changing. There isn't separate terminology to distiguish between scalar-valued acceleration (the rate at which speed is changing) and vector-valued acceleration (the vector which describes how velocity is changing).

If I start with a low speed and end up at a high speed, I've experienced a positive acceleration during that time.

As long as I travel at a constant velocity, I'm experiencing zero acceleration.

Hope it helps.

which one is correct:

I will travle to space with light VELOCITY
------------------------- light SPEED

thanx

which one is correct:

I will travle to space with light VELOCITY
------------------------- light SPEED

thanx alot WORMS !!

light SPEED

Too bad that neither sentence is correct. This would work:

"I will travel to space at light speed."

As would this:

"Travelling at light speed, I will go to space."

But even those sound a tad flaky. You'd have to rearrange "light speed" a bit to make them sound natural.

Read a physics textbooks and you'll find the answer. It's all to do with vectors.

> "I will travel to space at light speed."

This sentence is fine.

I will travel in/into space at light speed.

Speed has no direction, only magnitude
Velocity has both direction and magnitude.