[physics of senior one] If an object moves in a straight line in the same direction, the first half of the distance is V1, and the second half is V2, then the average speed of the whole course is 0____ When an object moves in a straight line in the same direction, the first half of the distance velocity is V1, and the second half of the distance velocity is V2, then the average speed of the whole course is 0________ . I did. The answer is 2v1v2 / V1 + v2

[physics of senior one] If an object moves in a straight line in the same direction, the first half of the distance is V1, and the second half is V2, then the average speed of the whole course is 0____ When an object moves in a straight line in the same direction, the first half of the distance velocity is V1, and the second half of the distance velocity is V2, then the average speed of the whole course is 0________ . I did. The answer is 2v1v2 / V1 + v2

Well, a very simple question ~ the answer is 2v1v2 / (V1 + V2)

When the object moves along a straight line, the displacement in t time is x, the velocity in 1 / 2x of the middle position is V1, and the velocity in 1 / 2T of the middle time is V2, V1 and V2
A. When the object is moving in a straight line with uniform acceleration, V1 > v2
B. When the object moves in a straight line with uniform deceleration, V1 > v2
C. When the object is moving in a straight line with uniform acceleration, V1 = v2
D. When an object moves in a straight line with uniform deceleration v1

Suppose that the object moves in a straight line with uniform acceleration
Then the speed of the object is faster and faster, the first half of the time the object has not moved to the middle of the displacement
Therefore, in the middle position, it takes more than half of the total time, so we can see that V1 > v2
Therefore, if it is a uniform deceleration linear motion, it is: v1

What is the actual speed of a ship going upstream in a river with static water speed V1 V2

V1-V2

When an object is moving in a straight line with uniform acceleration, if the average speed of the whole course is V1, the speed at the middle moment is V2, and the speed at half displacement of the whole course is V3, then the following relation is correct ()
A. v1＞v2＞v3B. v1＜v2=v3C. v1=v2＜v3D. v1＞v2=v3

The V-T image of uniform variable velocity motion with initial velocity V0 is as follows. Because the area enclosed by the graph line and the coordinate axis can be expressed as the displacement of the object motion, it can be obtained from the image: when the time is T2, the corresponding object velocity is V2, and the displacement of the object motion in this time, that is, the area enclosed by the graph line and the coordinate axis, is less than S2; when the object motion displacement is S2, the corresponding object velocity is V3, there is a graph It is obvious that V 2 ＜ V 3, according to the law of uniform variable speed motion, the average speed of its whole motion is equal to the speed at the middle time, that is, v 1 = V 2