# Questions tagged [velocity]

The time rate of change of the position of an object

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### What does this equation regarding Kepler's laws of planetary motion actually mean?

I'm doing a project in multivariable analysis regarding Kepler's laws of planetary motions and the following equation was a recommended equality to use, but none of the variables were actually defined:...
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### Why the acceleration is specified if I know the coordinates and velocity?

And I don’t understand why the acceleration can be specified if we know the coordinates and velocity
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### What is the displacement between $t=1$ and $t=8$? [closed]

Given the graph above, what is the displacement between $t=1$ and $t=8$?I thought this was a straight forward questions: It's supposed to be the area under the curve. Moving the time axis up to where ...
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### how can calculate of terminal velocity in water tank? [closed]

I want to calculate the final velocity of a steel sphere of $10 \text{mm}$ diameter, falling inside a $1\text{m}$ height tank. Also, how to calculate the drag force and the buoyancy force?