Englishfor English speakers
cluster
Noun
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A cluster is anything that is more than one thing put together.
In the market, you can find a cluster of bananas.
acceleration
Noun
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Acceleration is a change in speed.
As the plane took off, the acceleration pressed her into her seat.
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Acceleration is by how much a speed or velocity goes up.
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derivative for velocity,has formula matha=\lim_{\Delta x \to 0}\frac{\Delta v}{\Delta t}/math .