Speed of a body can not be_______?
Correct answer: C. Negative
- A. Zero
- B. Positive
- C. Negative
- D. None
Explanation
Speed is the magnitude of velocity, so it can be zero or positive but cannot be negative; its SI unit is m/s. Students often choose zero because a stationary body has zero speed, but zero is allowed, whereas negative speed is not.
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About Displacement and Velocity
Displacement is the directed change in position, while velocity is the rate of change of displacement and includes both magnitude and direction. The topic connects position-time and velocity-time graphs with average and instantaneous values, and distinguishes displacement from distance and velocity from speed.
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