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In common usage Velocity and Speed are used interchangeably. However, velocity has a specific meaning in the scientific sense.

speed is the rate at which you are moving.
velocity is the rate at which you are moving in a specific direction.

So if two space ships are heading away from the sun in different directions, but with the same speed, these spaceships are said to have a different velocity.

Related to velocity is acceleration. Again in common usage it is how fast you are speeding up or slowing down. In science it has a similar meaning but it is the rate of change of velocity.

In other words, you can experience acceleration simply by changing you direction of travel, even if you keep the speed constant.

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