Choose which of the following is the correct formula of acceleration. 

Concept: Acceleration is defined as the rate of change in velocity. It is represented by the letter a.

The SI unit of acceleration is m/s².

Equation of motion: These are the mathematical equations used to find the final velocity, displacements, time, and so on of a moving object without taking into account the force acting on it.

v = u+ at

Here, v = final velocity, u = initial velocity, a = acceleration of body under motion, and t = time is taken by the body under motion.

According to the above equation of motion: v = u + at

So,

$a=\frac{(v-u)}{t}$

The formula for finding acceleration is $\frac{(v-u)}{t}$. So option 4 is correct.