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Two observers are moving towards each other at speeds of 20 m/s and 30 m/s. What

Practice Questions

Q1
Two observers are moving towards each other at speeds of 20 m/s and 30 m/s. What is the speed of one observer as seen by the other?
  1. 10 m/s
  2. 20 m/s
  3. 50 m/s
  4. 60 m/s

Questions & Step-by-Step Solutions

Two observers are moving towards each other at speeds of 20 m/s and 30 m/s. What is the speed of one observer as seen by the other?
Correct Answer: 50 m/s
  • Step 1: Identify the speeds of the two observers. Observer 1 is moving at 20 m/s and Observer 2 is moving at 30 m/s.
  • Step 2: Understand that when two objects are moving towards each other, their speeds add up to find the relative speed.
  • Step 3: Add the speed of Observer 1 (20 m/s) to the speed of Observer 2 (30 m/s).
  • Step 4: Calculate the total: 20 m/s + 30 m/s = 50 m/s.
  • Step 5: Conclude that the speed of one observer as seen by the other is 50 m/s.
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