The magnitude of velocity (velocity) is equal to the displacement value of an object in unit time, but it is also defined that the length of an object's trajectory is related to the time it takes So, what is the rate

In physics, velocity is a vector equal to the ratio of the displacement of an object to the corresponding time
Speed is equal to the ratio of the length of an object's trajectory to the time it takes. It is a scalar
Relationship between the two: the average velocity is generally not equal to the velocity (when moving in a straight line in one direction, the two are equal)
The magnitude of instantaneous velocity is instantaneous velocity

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2. What is the physical meaning of speed
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4. What is the effect of velocity in physics When a physical object moves in a straight line at a speed of 0.1m/s under the action of tensile force, the friction force is 10N. If the object still moves in a straight line at a speed of 0.5m/s, what is the horizontal tensile force? How much is the friction force? Why? (excluding air resistance) Like this problem, the friction force and the pull force should be the same, both are 10N, but the speed is not determined by the pull force. The friction force has nothing to do with the speed, but the friction force is equal to the pull force, so what determines the speed
5. What is the definition of physical velocity
6. Give me some physics questions and answers (about distance, speed and time) For example, it takes someone 80 seconds to walk 100 meters, From the formula v = s / T =100m/80s =1.25m/s
7. The two trains run in opposite directions on two parallel straight rails. The length of train a is 150m, and that of train B is 200m. The speed of train a is 54km / h, and that of train B is 72km / h. how long does it take for the two trains to meet and stagger?
8. Know the distance ratio and time ratio of a and B objects, how to find their speed ratio
9. Velocity is a description of the motion of an object______ And sports_____ It can also be said to describe objects______ How fast and how slow is the change_______ The direction of change
10. Can speed, time and distance be negative
11. According to this definition, if the velocity of an object increases from V1 to V2 in t time, the acceleration is V2 − v1t. An existing small ball starts to move at an acceleration of 3m / S2 for 2S, then the velocity of the small ball at the end of 2S is () A. 0B. 2m/sC. 3m/sD. 6m/s
12. Concept 1. Distance and time -- meaning 2. The physical quantity representing the motion of an object is numerically equal to that of the object passing through in-
13. What's the difference between acceleration time diagram and velocity time diagram
14. What's the secret of speed time chart in physics? Which questions must be drawn?
15. Picture a is the distance time image of a uniform linear motion. Please draw the speed time image of the object in picture B
16. The distance time image of an object moving in a straight line at a uniform speed is shown in Fig. (1). According to (1), the speed time image of the object moving in (2) is drawn Guidance and Practice
17. How to draw the distance time image according to the speed time image Let's not pass on the picture. Let's describe it orally: given that the speed time image is a line segment parallel to the time axis, how to draw the distance time image?
18. The method to calculate the instantaneous velocity of each counting point is (△ X1 + △ x2) / 2 △ T. how to calculate the instantaneous velocity of the first point and the last point
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