When an object moves eastward along a straight line, the average velocity of the first half displacement is 3m / s, and the average velocity of the second half displacement is 2m / s, then the average velocity of the whole displacement is () A. 2.5 m/sB. 1.2 m/sC. 2.4 m/sD. 2.3 m/s

Let the total displacement be x, the time for the first half of the displacement be T1 = x2v1 = x2v1, and the time for the second half of the displacement be T2 = x2v2. From the average velocity formula v = XT, v = x2v1 + x2v2 = 2v1v2v1 + V2 = 2.4m/s

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1. When an object moves eastward along a straight line, the average velocity of the first half displacement is 3m / s, and the average velocity of the second half displacement is 2m / s, then the average velocity of the whole displacement is () A. 2.5 m/sB. 1.2 m/sC. 2.4 m/sD. 2.3 m/s
2. When an object moving in a straight line with uniform acceleration passes through points a, B and C in turn, the displacement SAB = SBC. It is known that the average velocity of the object in AB section is 1m / s, and the average velocity in BC section is 3m / s, then the instantaneous velocity of the object at point B is () A. 1.5m/sB. 2m/sC. 5m/sD. 2.5 m/s
3. When a particle with uniform acceleration passes through three points a, B and C continuously, it is known that ab = BC, and the average velocity of the particle in AB section is 3M/ When a particle moving in a straight line with uniform acceleration passes through three points a, B and C continuously, it is known that ab = BC, and the average velocity of the particle in AB section is 3m / s, and the average velocity in BC section is 6m / s, then the velocity of the particle in B is ()
4. When an object moves in a straight line with constant speed, its velocity is 3 m · S-1 at a certain time, and 9 m · S-1 after 1 s A. The displacement may be less than 5MB. The displacement may be less than 3mc. The acceleration may be less than 11m · s-2d. The acceleration may be less than 6m · S-2
5. When an object moves in a straight line with uniform speed change, the speed is 4m / s at a certain moment, and becomes 10m / s after 1s. What is the acceleration of the object? The answer is that when the initial velocity direction is positive, there are two cases of the end velocity. If the initial velocity is negative, the end velocity is positive, and 10 minus 4 = 14, the acceleration will be 14m / s Square, there will be one more case The acceleration is - 6m / s Square.
6. For an object moving in a straight line with uniform deceleration, the velocity at a certain moment is 8m / s, and after 1s, the velocity becomes 4m / s, then the displacement of the object passing through in 1s
7. The speed of a is 2 m / s, and that of B is 3 M / s. The ratio of time they take to pass the same distance is______ The ratio of the distance traveled in the same time is______ ．
8. The speed of a is 2 m / s, and that of B is 3 M / s. The ratio of time they take to pass the same distance is______ The ratio of the distance traveled in the same time is______ ．
9. A and B start from the same place along the same road at the same time. A's speed is 2m / s, B's speed is 3m / s, after 5 minutes How far away are they from each other? There are two kinds of solutions, both written out, and there must be a process
10. On the straight road, car a and car B move in the same direction. Car B moves in a straight line at a speed of 3 M / s. when car B is 4 m in front of car a, car a will leave the road At rest, it starts to make a uniform acceleration linear motion with an acceleration of 2 m / S2. When car a catches up with car B, it immediately makes a uniform deceleration linear motion with an acceleration of - 4 m / S2. How long will it take car B to catch up with car a again?
11. The average speed of the first half displacement is 3m / s, the average speed of the second half displacement is 6m / s, what is the average speed of the whole process How to calculate 4m / S? Why not 4.5m/s?
12. When an object is moving in a straight line with uniform acceleration, the average speed of the first half of the displacement is 3m / s, and the average speed of the second half is 6m / s, what is the speed when it passes through the middle position?
13. When an object is moving in a straight line with uniform acceleration, the average speed of the first half of the displacement is 3m / s, and the average speed of the second half is 6m / s, what is the speed when it passes through the middle position?
14. The object to be uniformly added passes through three points A.B.C in turn, XAB = XBC. It is known that the average velocity of the object in AB section is 3m / s, and that in BC section is 6m / s. The average velocity of the object at B point is 3m / s
15. When an object moving in a straight line with uniform acceleration passes through points a, B and C in turn, the displacement XAB = XBC. It is known that the average velocity of the object in AB section is 3m / s, and that in BC section is 6m / s, then the instantaneous velocity of the object at point B is () A. 4 m/sB. 4.5 m/sC. 5 m/sD. 5.5 m/s
16. When an object moving in a straight line with uniform acceleration passes through points a, B and C in turn, it is known that ab = BC, and the average velocities of AB and BC sections are V1 = 3m / s and V2 = 6m / s respectively (1) What are the instantaneous velocities VA, VB and VC of an object passing through points a, B and C? Why can't we use the simultaneous formula (VA + VB) / 2 = 3, (VB + VC) / 2 = 6, (VA + VC) / 2 = VB to calculate VB equal to 4.5? Please tell me why it's not right to do so
17. A small ball with a mass of 1 kg is thrown horizontally at an initial speed of 3 M / s, and the landing speed is 5 m / s, regardless of the resistance, g = 10 m / S ^ (1) How high is the throw point from the ground? (2) What is the instantaneous power of gravity when the ball is about to land?
18. (Physics of senior two) an object is thrown horizontally at the speed of 3m / s, and the landing speed is 5m / s. The flight time and displacement of the object are calculated
19. When an athlete puts a shot, it is 5 / 3M above the ground at the first time of putting the shot. The landing point of the shot is 10m away from the corresponding point on the ground at the first time of putting the shot. The highest point of the shot is 3M above the ground. It is known that the route of the shot is a parabola. The analytical formula of the parabola can't be solved
20. Dissolve two shot with radius of 3M and 5m to make a bigger shot. What is the radius of the big shot (accurate to 0.1cm)?