A person walks at 4 km/h in still water. If the current of the river is 2 km/h,
Practice Questions
Q1
A person walks at 4 km/h in still water. If the current of the river is 2 km/h, what is the speed of the person relative to the bank when walking upstream?
2 km/h
4 km/h
6 km/h
8 km/h
Questions & Step-by-Step Solutions
A person walks at 4 km/h in still water. If the current of the river is 2 km/h, what is the speed of the person relative to the bank when walking upstream?
Step 1: Understand that the person walks at a speed of 4 km/h in still water.
Step 2: Know that the river has a current that flows at 2 km/h.
Step 3: When the person walks upstream, they are walking against the current of the river.
Step 4: To find the speed of the person relative to the bank, subtract the speed of the current from the speed of the person.
Step 5: Calculate the speed: 4 km/h (person's speed) - 2 km/h (current's speed) = 2 km/h.
Step 6: Conclude that the speed of the person relative to the bank when walking upstream is 2 km/h.
Relative Speed – Understanding how to calculate the speed of an object in relation to another moving object, such as a person walking in a river with a current.
Vector Addition – Applying the concept of vector addition to determine the resultant speed when two velocities are acting in opposite directions.
