Final answer:
To calculate the acceleration, subtract the initial velocity from the final velocity and divide it by the time taken. In this case, the acceleration of the object is 4.35 m/s².
Step-by-step explanation:
This involves calculating the acceleration of an object given its initial and final velocity and the time taken to change between these velocities. Acceleration is defined as the rate of change of velocity per unit time. To find it, we use the formula: a = (Vf - Vi) / t. Where: a is acceleration, Vf is the final velocity, Vi is the initial velocity, and t is the time taken to accelerate. Given that the initial velocity (Vi) is 18 m/s, the final velocity (Vf) is 68 m/s, and time (t) is 11.5 seconds: a = (68 m/s - 18 m/s) / 11.5 s, a = 50 m/s / 11.5 s, a = 4.35 m/s². The acceleration of the object is 4.35 m/s².