Final answer:
To calculate the average acceleration of the boy, use the equation for average acceleration and plug in the given values for final velocity, initial velocity, and time.
Step-by-step explanation:
To calculate the average acceleration, you need to determine the change in velocity and the change in time. In this case, the final velocity (vx) is 0 and the initial velocity (ux) is unknown. However, the time (t) is given as 1.6 seconds. Use the equation for average acceleration, ax = (vx - ux) / t, and plug in the given values. The average acceleration can be calculated by dividing the change in velocity (0 - ux) by the change in time (1.6 seconds).