The object moves in a straight line with an acceleration of 2m / S2 at constant deceleration. The displacement within 2 seconds before stopping is 1 / 4 of the whole displacement. The initial velocity of the object is calculated

Well, it's very simple. First of all, you can divide the process of motion into two parts. The first part is the process of the object two seconds before it stops moving. The second part is the process of the object moving to rest two seconds before it stops moving. So let's analyze the first part. Well, I'll draw a sketch for you

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1. What is the acceleration of a car running at a constant speed of V = 10 m / s when the engine is turned off at the end of the second second second and the average speed is 9 m / s in the third second?
2. The average speed in the third second is 9 m / s. find (1) the acceleration of the uniform deceleration of the car (2) the displacement of the car in 10 s
3. When the vehicle runs at a constant speed of 10 m / s, the engine is turned off at the end of the second second second, and the average speed in the third second is 9 m / s---- The displacement of the vehicle in 10s is ----- M It's a process!
4. A car with a uniform speed of 10m / s, after turning off the engine, decelerates with an acceleration of 4m / S ^ 2. What are the speeds at the end of 2S and 3S?
5. The acceleration of a particle is 1 m / S2 in the first second and 1 m / S2 in the second second - 1m / S2, the third is 1m / S2, and the fourth is - 1m / S2. After 100 seconds, the particle displacement is "average velocity in 100 seconds" and "instantaneous velocity at the end of 100 seconds"?
6. [example 1] the car starts to move in a straight line with uniform acceleration at the acceleration of 1 m / S2 from standstill
7. When car a and car B start from the same place at the same time, car a decelerates uniformly with the initial speed of 16m / s and the acceleration of 2m / S2; car B accelerates linearly with the initial speed of 4m / s, the acceleration of 1m / S2 and car a in the same direction. The maximum distance between the two cars when they meet again and the movement time of the two cars when they meet again are calculated
8. When car a and car B start from the same place at the same time, car a decelerates uniformly with the initial speed of 16m / s and the acceleration of 2m / S2; car B accelerates linearly with the initial speed of 4m / s, the acceleration of 1m / S2 and car a in the same direction. The maximum distance between the two cars when they meet again and the movement time of the two cars when they meet again are calculated
9. A and B start from the same ground and direction at the same time and make a straight-line movement on the same horizontal highway. A makes a uniform deceleration movement with an initial speed of 16m / s and an acceleration of 2m / S2, Party A and Party B start from the same ground and direction at the same time, and move in a straight line on the same level highway. Party A decelerates uniformly with an initial speed of 16m / s and an acceleration of 2m / S2, and Party B moves uniformly with an initial speed of 4m / s and an acceleration of 4m / S2 (1) The maximum distance between two cars (2) How long does it take for two cars to meet
10. A and B start at the same place and direction. A decelerates with an initial speed of 16m / s and an acceleration of 2m / s, and B decelerates with an acceleration of 2m / s 4 m / s initial velocity, 1 m / s Square acceleration, find 1. The maximum distance between two vehicles before they meet again? 2. The time required for two vehicles to meet again? Can we use equations in mathematics,
11. The acceleration is 3m / S ^ 2. If the initial velocity is 20m / s, the velocity of the particle will decrease after 4S
12. At most, a rope can pull an object with a mass of 3M and decelerate with a uniform acceleration If a rope can pull an object with a mass of 3M at most and decelerate at the acceleration of a, then the rope can pull an object with a mass of m at most and increase at the same speed?
13. After landing, the aircraft decelerates and glides evenly. The initial speed is 60m / s and the acceleration is 3m / S2. How long does the aircraft stop after landing () A. 10sB. 15sC. 20sD. 30s
14. The car moves in a straight line with a uniform deceleration at an acceleration of 3m / S2, passing two poles with a distance of 10m, and passing the second pole at a speed of 2m / s Find 1. Speed of car passing through the first pole 2. Time of car passing through two poles
15. The initial velocity of a particle is 10m / s and the acceleration is 2m / s (1) The speed at the end of the fifth second (2) Average velocity displacement in the first five seconds (3) Average velocity displacement in the fifth second
16. The initial velocity is 10 m / s, and the acceleration is 2 m / s
17. The initial velocity of the particle is 10 m / s, and it becomes 2 m / s after 4 s,
18. If the object with initial velocity of 2m / s moves in a straight line with uniform acceleration and reaches 10m / s after 4S, the acceleration of the object is zero Its velocity at the end of the second second is, and its displacement at the end of the third is
19. When an object is moving in a straight line with uniform acceleration, the displacement in the first second is 6m, and the displacement in the second second is 10m
20. When an object moves in a straight line with uniform deceleration, the acceleration is 2m / s. After two seconds of movement, its final velocity is half of its initial velocity. The displacement of the object in this 2S and the distance from the object to stop are calculated