If acceleration is constant then what will be the velocity and speed of the object?
We know that acceleration is the rate of change of velocity per unit of time.
Therefore, if acceleration is constant then it means the velocity changes at a constant rate.
For example, if the velocity of a particle moving in a straight line changes uniformly (at a constant rate of change) from 3 m/s to 6 m/s over one second, then its constant acceleration is 3 m/s2. $\left[\because Acceleration=\frac{change\ in\ velocity}{time}\Leftrightarrow \frac{6-3}{1}=\frac{3}{1}=3m/{s}^{2}\right]$
Velocity-time graphs with constant/uniform acceleration.
When the speed of the body changes at a uniform rate, its speed changes by equal amounts in equal intervals of time. So, the velocity-time graph of a body moving with uniform acceleration is a straight line.
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