Weegy: A passenger in the rear seat of a car moving at a steady speed is at rest relative to C. the front seat of the car User: One kilometer equals 1000 meters. What does the prefix kilo- mean?
A. 1
B. 10
C. 100
D. 1000 Weegy: The prefix kilo means D. 1000. User: A ball is rolled uphill a distance of 5 meters before it slows, stops, and begins to roll back. The ball rolls downhill 9 meters before coming to rest against a tree. What is the magnitude of the ball’s displacement?
A. 4 meters
B. 9 meters
C. 14 meters
D. 45 meters Weegy: A. 4 meters .The ball only moved 4 mts away from initial position, regardless of the 9 meter travel. User: Displacement vectors of 4 km south, 2 km north, 5 km south, and 5 km north combine to a total displacement of
A. 16 km north
B. 11 km west
C. 6 km south
D. 2 km south Weegy: It is: D. 2 km south. [smile] User: What is the most appropriate SI unit to express the speed of a cyclist in the last leg of a 10-km race?
A. km/s
B. km/h
C. mm/s
D. cm/h Weegy: B. km/h User: Speed is the ratio of the distance an object moves to
A. the amount of time needed to travel the distance.
B. the direction the object moves.
C. the displacement of the object.
D. the motion of the object. Weegy: A. the amount of time needed to travel the distance. User: Which of the following statements is true?
A. An object that is accelerating is always changing direction.
B. An object has an instantaneous acceleration, even if the acceleration vector is zero.
C. An object at rest has an instantaneous acceleration of zero.
D. Instantaneous acceleration is always changing. Weegy: C. An object at rest has an instantaneous acceleration of zero. User: What is instantaneous acceleration?
A. how fast a speed is changing at a specific instant
B. how fast a velocity is changing at a specific instant
C. how fast a direction is changing at a specific instant
D. all of the above Weegy: B. how fast a ... (More)

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