The distance covered by an object in unit time is called _______.

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RRC Group D Previous Paper 41 (Held On: 16 Oct 2018 Shift 2)
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  1. distance 
  2. displacement 
  3. average speed
  4. average velocity

Answer (Detailed Solution Below)

Option 3 : average speed
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The correct answer is the average speed.

Key Points

  • Speed is the scalar measure of the rate of movement of a body expressed either as the distance traveled divided by the time taken.
  • Distance is a scalar quantity that refers to "how much ground an object has covered" during its motion.
  • Displacement is a vector quantity that refers to "how far out of place an object is".
    • It is the object's overall change in position.
  • Average speed is the average of all instantaneous speeds. It is found simply by a distance/time ratio.
  • Velocity is defined as a vector measurement of the rate and direction of motion of an object.
    • Velocity formula when an object moving in a straight line: r = d / t.
      • r is the rate or speed, d is the distance moved, t is the time it takes to complete the movement.
  • A body moving with a constant speed has velocity without acceleration.
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