Answer:
a = -10 m/s²
Step-by-step explanation:
Step 1: Given data
Initial velocity of the boat (vi): 30 m/s
Final velocity of the boat (vf): 5 m/s
Time elapsed (t): 2.5 s
Acceleration (a): ?
Step 2: Calculate the acceleration of the boat
The acceleration is equal to the change in the velocity divided by the time elapsed.
a = vf - vi / t
a = 5 m/s - 30 m/s / 2.5 s
a = -10 m/s²