What is the speed of motion in physics no

Speed, relative speed is only one kind of speed

RELATED INFORMATIONS

1. Why can only instantaneous velocity accurately describe the speed of a moving object with variable speed?
2. How to distinguish the speed and instantaneous speed
3. Why is the instantaneous velocity the instantaneous velocity and the average velocity not the average velocity? I hope I can explain it clearly and understand it easily
4. The instantaneous speed of high school physics is usually called speed. The average speed is distance / time. I know. How to calculate the speed
5. One question is like this One person climbs the mountain, climbs to the top of the mountain from the foot of the mountain, and then returns to the foot of the mountain along the original road. The average speed up the mountain is V1, and the average speed down the mountain is v2. What is the average speed and average speed of the round trip? How to express it? In addition, when the person goes up and down the mountain, the displacement is 0. When the position changes, the average speed is 0. Is that wrong? What's the difference between the two? I know that velocity is a vector and has direction of magnitude. Velocity is only a scalar, regardless of whether it is round-trip or not
6. When the displacement in the first second is 1 m, the instantaneous velocity at the end of the first second is () A. 1m/sB. 0.5m/sC. 2m/sD. 4m/s
7. An Internet bar, Members normally surf the Internet for 3 yuan an hour, and now they are engaged in activities, 50 for charging, 100 for charging, 100 for charging, 200 for charging, 300 for charging It used to be 50 for 20, 100 for 50 Which rate is cost-effective and how to calculate it? My brother and sister help me with the calculation problem given by the teacher
8. The product of multiplication of three numbers is equal
9. The next number As the title
10. Observe the arrangement of the following numbers, and then fill in the appropriate numbers: 3, - 7, 11, - 15, 19, - 23______ ，______ ．
11. In physics, what is the speed of an object
12. The following is true A if the instantaneous velocity of an object at any time in a certain period of time is equal to 0, then its average velocity in this period of time must be equal to 0 B if the average velocity of an object in a certain period of time is equal to 0, then its instantaneous velocity at any time in this period of time must be equal to 0 C in uniform linear motion, the average velocity of an object in any period of time is equal to its instantaneous velocity at any time, In D variable speed linear motion, the average velocity of an object in any period of time is not equal to its instantaneous velocity at any time
13. In the 2008 Beijing Olympic Games, Jamaican bolt (as shown in the picture) is a recognized flying man in the world. He broke two world records and won two gold medals in the men's 100m final and men's 200m final by 9.69s and 19.30s respectively A. The displacement in the 200m final is twice that in the 100m final. B. the average speed in the 100m final is about 10.32m/s. C. The average speed in the 200m final is about 10.36m/s. D. the maximum speed in the 100m final is about 20.64m/s
14. I seem to understand the difference between the instantaneous speed and the average speed, but I still have some doubts. For example, the speed of the train after speed increase is 150km / h. I think I can also see that the speed of the train at a certain point of displacement is 150km / h. how to explain this and how to deal with this type of problem
15. It takes 5 seconds for the car to stop from braking. During this period, the distance of the car before 1 second is 9 m, 7 m, 5 m, 3 m and 1 m respectively Ask: the average speed of the car in the first 1s, the first 2S, the first 3S, the first 4S and the whole journey. Which of the five average speeds is closest to the instantaneous speed when the car closes the throttle? Is it slightly larger or smaller than this instantaneous speed? We must answer it!
16. Can speed, time and distance be negative
17. 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
18. Know the distance ratio and time ratio of a and B objects, how to find their speed ratio
19. 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?
20. 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