How is instantaneous speed related to instantaneous velocity?
AIt is the average of all instantaneous velocities
BIt is the magnitude of the instantaneous velocity
CIt is the instantaneous velocity divided by time
DIt is the instantaneous velocity taken as negative
Answer & Solution
Correct answer: B. It is the magnitude of the instantaneous velocity
1. Instantaneous speed is the magnitude of the instantaneous velocity.
2. A passenger with an instantaneous velocity of -3.0 m/s has an instantaneous speed of 3.0 m/s.
3. Speed keeps the size of the velocity and drops the direction.
4. Dividing a velocity by a time would give an acceleration, not a speed.
_Source: OpenStax College Physics (CC BY 4.0), Ch 2 "Kinematics", section 2.3 Time, Velocity, and Speed_
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