A car is moving at 80 km/h and a motorcycle is moving at 60 km/h in the same dir

Practice Questions

Q1
A car is moving at 80 km/h and a motorcycle is moving at 60 km/h in the same direction. What is the speed of the motorcycle relative to the car?
  1. 20 km/h
  2. 60 km/h
  3. 80 km/h
  4. 140 km/h

Questions & Step-by-Step Solutions

A car is moving at 80 km/h and a motorcycle is moving at 60 km/h in the same direction. What is the speed of the motorcycle relative to the car?
Correct Answer: -20 km/h
  • Step 1: Identify the speed of the car, which is 80 km/h.
  • Step 2: Identify the speed of the motorcycle, which is 60 km/h.
  • Step 3: Since both the car and motorcycle are moving in the same direction, we need to find the relative speed by subtracting the speed of the car from the speed of the motorcycle.
  • Step 4: Calculate the relative speed: 60 km/h (motorcycle) - 80 km/h (car) = -20 km/h.
  • Step 5: The negative sign indicates that the motorcycle is behind the car, so we can say the motorcycle is 20 km/h behind the car.
  • Relative Speed – The speed of one object as observed from another object, calculated by subtracting the speeds of the two objects when they are moving in the same direction.
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