Determine the acceleration of uniform linear motion 2, the displacement difference of continuous equal time is equal to at & sup2; how to deduce it? Please explain in detail The frequency of power supply used in the experiment of uniform variable speed linear motion is 50 Hz. Take a piece of paper as the starting point, and study how to calculate X1 from 0 to 40-1 X1 1-2 x2 = 62-3 X3 = 9

Let the initial velocity of the object be V0, let three time points T1, T2, T3, where t2-t1 = t, t3-t2 = t, the displacement from the beginning to T1 is: S1 = v0t1 + (1 / 2) a (T1) ^ 2, the displacement from the beginning to T2 is: S2 = v0t2 + (1 / 2) a (T2) ^ 2, the displacement from the beginning to T3 is: S3 = v0t3 + (1 / 2)

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1. Is the average acceleration equal to the instantaneous acceleration in the uniform linear motion? Why? How to calculate the instantaneous acceleration? How to calculate the average acceleration?
2. It is proved that: (1) if the difference of displacement of an object moving uniformly in a straight line is a fixed value in any two continuous equal time, and the acceleration is a, the continuous equal time is t, and the difference of displacement is △ x, then △ x = at2. (2) in the uniformly variable linear motion, the instantaneous velocity at the midpoint of displacement is VX2 = V20 + v2t2
3. Please prove that the displacement difference of an object moving in a straight line with uniform speed change is a constant value in any two consecutive equal time periods. Let the acceleration be a and the time periods be continuous and equal If t is t and the displacement difference is Δ x, then Δ x = the square of a * t
4. After hitting the wall, the ball rebounds at the original speed. The contact time between the ball and the wall is 0.2 seconds
5. Physics problems in grade one of senior high school If a gymnast falls from a certain height, his center of gravity will drop about 15cm when his feet fall to the ground. What is the maximum limit height of a gymnast's jump? It's better to have a detailed explanation
6. Physics of grade one in Senior High School: the direction of velocity and acceleration in uniform acceleration motion and uniform variable speed motion Physics of grade one in Senior High School: the direction of velocity and acceleration in uniform acceleration linear motion and uniform variable speed linear motion In the uniformly accelerated linear motion, the direction of acceleration is not changed. Since it is an accelerated motion, the direction of velocity is the same as that of acceleration, that is, the direction of velocity displacement acceleration is the same? In the uniform speed change linear motion, is the uniform speed change either uniform acceleration or uniform deceleration? Is the direction of the velocity displacement acceleration of the uniform speed change linear motion the same? In a uniformly accelerated linear motion, the direction of acceleration remains unchanged. Is it true that since it is an accelerated motion, the direction of velocity is the same as that of acceleration, that is, the direction of velocity, displacement and acceleration is the same? In the uniform speed change linear motion, is the uniform speed change either uniform acceleration or uniform deceleration? Is the direction of the velocity, displacement and acceleration of the uniform linear motion the same? Break a sentence··
7. For a particle moving in a straight line with uniform velocity variation, the greater the velocity variation in the same time, the greater the acceleration
8. When an object is moving in a straight line with constant speed change, does the acceleration change equally in the same time
9. The definition of uniform variable speed linear motion is the same acceleration, that is to say, as long as the speed change / time change is the same? Look at it The definition of uniform variable speed linear motion is the same acceleration, that is to say, as long as the speed change / time change is the same? Don't stress that the speed change must be the same in the same time, as long as the ratio is the same? That is, the speed change in two seconds is four meters per second, and the speed change in four seconds is eight meters per second. So the acceleration is the same, so is he still moving in a straight line with constant speed?
10. For uniform linear motion, the acceleration change is the same in the same time Why is this sentence wrong? I know it's invariable. Isn't it a constant function? In the same time change is not 0? 0 is not the same?
11. Why is the displacement difference of uniform velocity linear motion in continuous equal time interval a constant
12. What does it mean that the displacement difference of uniform velocity linear motion in continuous equal time interval is a constant
13. It is proved that the difference of displacements in continuous equal time is equal to a constant
14. 1. It is proved that the difference of displacement is equal to a constant in a continuous and equal period of time in a uniform linear motion 2. It is proved that the instantaneous velocity in the middle of a period of time is equal to the average velocity in this period of time 3. The displacement of a particle moving in a uniform straight line is 24m and 64M respectively in two continuous equal time intervals, and each time interval is 4S. Calculate the initial velocity and acceleration of the particle. (solve by more than two methods)
15. Why is acceleration in meters per second Or what does the second power of s represent? How did it come from
16. When an object moves in a straight line with uniform acceleration from a certain moment, its initial velocity is known to be four meters per second, and its acceleration is two meters per second
17. When an object moves in a straight line with uniform deceleration, the initial velocity is 12 meters per second, the acceleration is 2 meters per second, and the displacement of the object in a second is 6 meters. How far can it move after that Why can't we do this According to v = V0 + at, we get 0 = 12 + (- 2) t, t = 6S is to calculate how long he stops Then use x = v0t + 1 / 2at2 to find out x = 36-6 = 30. Why can't we do this? Find out the reason and correct method
18. When an object moves in a straight line with uniform acceleration, it moves 10 meters in the second two seconds, and the acceleration is 2 meters every second square second. What is the average speed in the eighth two seconds?
19. The acceleration is 2.5 meters per second, and the displacement is 10 meters in the last two seconds
20. What is the unit of acceleration in the international system of units