The relationship between time and speed of uniform speed linear motion in Senior High School What is the acceleration of an object when it starts to move in a straight line with uniform acceleration from a static state and its average speed in the 7th second is 2.6m/s A.4m/s^2 B.037m/s^2 C.2.6m/s^2 D.0.43m/s^2

The relationship between time and speed of uniform speed linear motion in Senior High School What is the acceleration of an object when it starts to move in a straight line with uniform acceleration from a static state and its average speed in the 7th second is 2.6m/s A.4m/s^2 B.037m/s^2 C.2.6m/s^2 D.0.43m/s^2

Analysis: because the average speed is equal to the instantaneous speed at the middle time, the average speed in the seventh second is equal to the instantaneous speed at the end of 6.5 seconds. Because the initial speed is zero, the formula v = at is: 2.6 = ax6.5, a = 0.4 (M / S ^ 2)
So this question has no answer!
After changing a option to 0.4m/s ^ 2, a option is correct

When an object moves in a straight line with uniform speed change, its velocity is 4 m / s at a certain moment, and it becomes 10 m / s after 1 s. in this 1 s, the ()
A. The displacement may be less than 4MB. The displacement may be more than 10mc. The acceleration may be less than 4m / S2D. The acceleration may be more than 10m / S2

When the direction of final velocity and initial velocity is the same, V0 = 4m / s, VT = 10m / s, t = 1s, then acceleration: a = vt − v0t = 10 − 41m / S2 = 6m / S2, acceleration is 6m / S2. Displacement: x = V0 + v2t = 4 + 102 × 1m = 7m; displacement is 7m. When the direction of final velocity and initial velocity is opposite, V0 = 4m / s, VT = - 10m /

How to deduce the relationship between the displacement and the velocity of the linear motion
How to calculate v = V0 + at x = v0t + ATD squared / 2
The formula "the square of V minus the square of V0 equals 2aX" is deduced

2aX = 2A (v0t + at's Square / 2) = 2avot + A's Square * t's Square; (1)
V squared = VO squared + 2atvo + a squared * t squared -- 2atvo + a squared * t squared = V squared - V0 squared; (2)
From (1) (2), we can get that the square of V minus the square of V0 equals 2aX

What are the formulas of uniform variable speed linear motion?

1) The results show that: 1. Average velocity vt2 = s / T (definition) 2. Useful inference vt2-vo2 = 2as3. Middle time velocity VT / 2 = VT + VO / 2 4. Final velocity VT = VO + at5. Middle position velocity vs / 22 = (VO 2 + vt2) / 2 6. Displacement S = vt2 t = VT + at2 / 2 = VT / 2 T7

How to judge which physical formula to use in the study of uniform velocity linear motion? I mean what quantity to give you, what quantity to ask you for, and what formula to use

Given V (0), a, T. find v (T), use V (T) = V (0) + at, find displacement x, use x = V (0) t + 1 / 2 × a (t ᦉ 710; 2), give V (T), V (0), a or X, find a or X, find displacement velocity formula: 2aX = V ᦉ 710; 2-V (0) ᦉ 710; 2, use these three basic formulas: velocity common

Straighten out the formula of uniform variable speed linear motion

1、 The motion of a particle (1) ---- linear motion 1) uniformly variable speed linear motion 1. Average velocity V flat = s / T (definition) 2. Useful inference vt2-vo 2 = 2As 3. Velocity V T / 2 = V flat = (VT + VO) / 2 4. Final velocity V T = VO + at 5. Velocity V S / 2 = [(VO 2 + vt2) / 2] 1 / 2 6

The formula of uniform variable speed linear motion

1、 Motion of particle (1) --- linear motion
1) Uniform linear motion
1. Average velocity v = s / T (definition)
2. Useful inference vt2-vo2 = 2As
3. Velocity VT / 2 = vplane = (VT + VO) / 2
4. Final velocity VT = VO + at
5. Middle position velocity vs / 22 = (VO2 + vt2) / 2
6. Displacement S = V flat t = VO T + at2 / 2 = VT / 2 t
7. Acceleration a = (VT VO) / T {with VO as the positive direction, a and VO are in the same direction (acceleration) a > 0; if a is in the opposite direction, a

On the formula of linear motion with uniform speed change
Can the formula v = x / T of uniform linear motion be used in uniform linear motion? And when should the formula v = (initial speed + final speed) / 2 be used in uniform linear motion?

Two formulas can be used for uniform linear motion, but the latter is unnecessary
Uniform variable speed linear motion is used for moving objects to do uniform variable speed linear motion
In fact, when you do a question, the question will generally explain what the object is doing

On the understanding of the average velocity formula v = st of variable speed linear motion, the correct one is ()
A. The size of V has nothing to do with the selection of S and T. b. it can accurately reflect the movement of an object. C. in any case, V is constant. D. It must indicate which distance or period of time is meaningful

A. The size of V depends on the selected distance and time; B. the average speed can not accurately know the movement of the object, such as when the moving object accelerates and decelerates; C. in variable speed movement, the speed of the object changes; D. when calculating the average speed, we must specify the average speed of the moving object in which period of time and which distance So D

What are the two formulas of the average velocity of uniform velocity linear motion?

Common:
1. V average = (V beginning + V end) / 2
2. Vmean = displacement X / time t
3. V average = V initial + A * t / 2
V mean = V end - A * t / 2
In fact, there are many ways to find the average speed under different conditions. As long as the owner has a good grasp of the essence of the problem and is familiar with the basic thinking of some physical problems, simple topics are very casual