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A boat is moving upstream at 10 km/h in a river that flows at 5 km/h. What is th

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Question: A boat is moving upstream at 10 km/h in a river that flows at 5 km/h. What is the speed of the boat relative to the riverbank?

Options:

  1. 5 km/h
  2. 10 km/h
  3. 15 km/h
  4. 0 km/h

Correct Answer: 15 km/h

Solution: 

Speed of boat relative to riverbank = Speed of boat - Speed of river = 10 km/h - 5 km/h = 5 km/h.

A boat is moving upstream at 10 km/h in a river that flows at 5 km/h. What is th

Practice Questions

Q1
A boat is moving upstream at 10 km/h in a river that flows at 5 km/h. What is the speed of the boat relative to the riverbank?
  1. 5 km/h
  2. 10 km/h
  3. 15 km/h
  4. 0 km/h

Questions & Step-by-Step Solutions

A boat is moving upstream at 10 km/h in a river that flows at 5 km/h. What is the speed of the boat relative to the riverbank?
  • Step 1: Identify the speed of the boat moving upstream, which is 10 km/h.
  • Step 2: Identify the speed of the river flowing downstream, which is 5 km/h.
  • Step 3: To find the speed of the boat relative to the riverbank, subtract the speed of the river from the speed of the boat.
  • Step 4: Perform the calculation: 10 km/h (boat speed) - 5 km/h (river speed) = 5 km/h.
  • Step 5: The result, 5 km/h, is the speed of the boat relative to the riverbank.
  • Relative Speed – Understanding how to calculate the speed of an object in relation to another moving object.
  • Vector Addition – Applying the concept of vector addition to determine the resultant speed when two velocities are involved.
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