Question

A boat is cruising in a straight line at a constant speed of 2.2 m/s when it is shifted into neutral. After coasting 10 m, the engine is engaged again, and the boat resumes cruising at the reduced constant speed of 1.2 m/s. What is the change in speed of the boat?

1) 0.2 m/s
2) 0.8 m/s
3) 1.0 m/s
4) 1.2 m/s

Answer 1

The change in speed of the boat is 1.0 m/s, calculated by subtracting the final speed of 1.2 m/s from the initial speed of 2.2 m/s.

Step-by-step explanation:

The change in speed of the boat is calculated as the absolute value of the difference between the initial speed and the final speed. The initial speed is 2.2 m/s and after the boat coasts and the engine is engaged again, it cruises at a reduced constant speed of 1.2 m/s. Therefore, the change in speed is 1.0 m/s (2.2 m/s - 1.2 m/s = 1.0 m/s), which corresponds to option 3 in the list provided.