A boat can travel at 10 km/h in still water. If it is moving downstream in a riv
Practice Questions
Q1
A boat can travel at 10 km/h in still water. If it is moving downstream in a river flowing at 5 km/h, what is the speed of the boat relative to the riverbank?
5 km/h
10 km/h
15 km/h
20 km/h
Questions & Step-by-Step Solutions
A boat can travel at 10 km/h in still water. If it is moving downstream in a river flowing at 5 km/h, what is the speed of the boat relative to the riverbank?
Correct Answer: 15 km/h
Step 1: Understand that the boat's speed in still water is 10 km/h.
Step 2: Know that the river is flowing at 5 km/h downstream.
Step 3: When the boat is moving downstream, its speed adds to the speed of the river.
Step 4: To find the total speed of the boat relative to the riverbank, add the speed of the boat (10 km/h) to the speed of the river (5 km/h).
Step 5: Calculate the total speed: 10 km/h + 5 km/h = 15 km/h.
Step 6: Conclude that the speed of the boat relative to the riverbank is 15 km/h.
Relative Speed – Understanding how to calculate the speed of an object in relation to another moving object.
Vector Addition – Applying the concept of adding velocities in the same direction to find the resultant speed.
