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Which of the following is a true statement concerning speed, velocity, and acceleration?
  • a)
    If the displacement of an object is zero, the speed must be zero
  • b)
    Speed is a vector quantity representing magnitude and direction
  • c)
    An object cannot accelerate if it is moving at a constant speed
  • d)
    An increase in speed must mean the object experiences acceleration
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
Which of the following is a true statement concerning speed, velocity,...
The vector quantity representing magnitude and direction is velocity, not speed
Because speed is not a vector quantity, constant speed cannot tell us direction of an object. Therefore you can move at constant speed but still accelerate by changing direction.
Displacement of an object could equal zero simply by moving in a circle. If your initial and final positions are the same, your displacement is zero but your speed is not.
An object can only experience an increase in speed if it is accelerated.
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