Motion
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"Rate of change" means how quickly something changes. Examples in physics include a speed as a rate of change of position - if your position changes 10 meters every second, then that (10 meters/second) is your rate of change of position, or your velocity. Or if your income increases by a thousand dollars a year, then that's the rate of change of your income - how quickly your income changes.
Rate of change in position is called velocity.
9 is in the tens position, which means 90. The 3 is in the hundreds position, which means 300. The 8 is in the ones position, which means 8.
I think it means- what position are you applyig for if your filling in a application form.
Rate of change of position = speedIf you also reveal the direction of the speed, then you have velocity.