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

V2^2=V1^2+2as
4=V1^2-2*3*10
V1=8m/s
t=(V2-V1)/a
=(2-8)/-3
=2s

RELATED INFORMATIONS

1. 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
2. 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?
3. The acceleration is 3m / S ^ 2. If the initial velocity is 20m / s, the velocity of the particle will decrease after 4S
4. 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
5. 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?
6. 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
7. 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!
8. 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?
9. 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"?
10. [example 1] the car starts to move in a straight line with uniform acceleration at the acceleration of 1 m / S2 from standstill
11. 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
12. The initial velocity is 10 m / s, and the acceleration is 2 m / s
13. The initial velocity of the particle is 10 m / s, and it becomes 2 m / s after 4 s,
14. 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
15. 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
16. 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
17. If the acceleration is 2m / S ^ 2 and the displacement is 1 / 4 of the whole displacement two seconds before the motion stops, then the initial velocity of the object is Don't use image method
18. The object moves in a straight line with constant deceleration in V0, stops in 6S, and the displacement in the last 2S is 2m. What is the acceleration, the initial velocity and the total displacement
19. The object moves in a straight line with uniform deceleration on the horizontal plane, and the acceleration is 5m / S2. The displacement of the object within 2S before stopping is calculated
20. The displacement of an object in 2S is 6 meters,