Given:
The initial velocity is

The initial position is x1 = 2.76 cm
The final position is x2 = - 5 cm
The time will be t = 2.25 s
To find the acceleration.
Step-by-step explanation:
The acceleration can be calculated by the formula

Here, the displacement is

On substituting the values, the acceleration will be

Final Answer: The acceleration is -12.84 cm/s^2