Concept:
Acceleration is the rate of change of velocity with respect to time.
So,
\(\displaystyle a=\frac{dv}{dt}\)
Step 1: Write the given velocity equation.
\(\displaystyle v=4t\)
Step 2: Differentiate velocity with respect to time.
\(\displaystyle a=\frac{dv}{dt}\)
\(\displaystyle a=\frac{d}{dt}(4t)\)
\(\displaystyle a=4\)
Step 3: Write the unit.
Acceleration is measured in:
\(\displaystyle \text{m/s}^2\)
So,
\(\displaystyle a=4\ \text{m/s}^2\)
Step 4: Final conclusion.
Hence, the acceleration is:
\(\displaystyle \boxed{4\ \text{m/s}^2}\)