The car starts to drive on the straight road from the standstill, and the graph of the car's acceleration changing with time within 60 s is as follows Can you tell me which formula to use?

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• 1. On a straight road, the speed of a car is 15m / s, and it starts to brake at a certain moment. Under the action of resistance, the car moves at an acceleration of 2m / S2. How far is the last car from the starting braking point after 10s of braking?
• 2. The car is moving forward on the straight road at the speed of 10m / s, and it starts to brake at a certain moment. If the acceleration is 2m / S ^ 2, the displacement of the car in the next 6S will be reduced The size is a24m b25m c75m d96m. Why is 24m wrong?
• 3. When the car moves in a straight line at a speed of 10 m / s on a straight road, it brakes when there is something in front of it, and the acceleration is 2 m / S2 What is the speed of the car after 3 seconds? What is the speed of the car after 7 seconds?
• 4. When the car moves in a straight line at a speed of 10m / s on a straight road, if there is something in front of it and the acceleration is 2m / S2, the speed of the car at the end of 3S after braking is 2m / S2______ &The displacement of the vehicle in 6S is______ m．
• 5. The bicycle decelerates at an initial speed of four meters per second. The acceleration is 0.2. How long does it take to climb a 20 meter slope You know, big brother, big sister, uncle and aunt
• 6. If the slope is 20 m long, how long does it take for a person to cross the top of the slope?
• 7. When someone rides a bicycle up a slope at the initial speed of V0 = 10m / s, the acceleration is 0.4m/s2 during the uphill process, and the speed decreases to 2m / s when he reaches the top of the slope. The time taken for the person to ride a bicycle up the slope is calculated
• 8. An object moves in a straight line at a constant speed. After 12M, the speed changes from 4m / s to 2m / s. calculate the acceleration
• 9. When an object is accelerating uniformly, its initial velocity is 2 m / s, and its displacement in the third second is 4.5 m, the acceleration is calculated
• 10. The initial velocity of the object is 5m / s, and the acceleration is - 2m / S ^ 2 What is the distance in 4 seconds if you slide on a rough horizontal surface? Is the object moving in the direction of acceleration to the left or deceleration to the right
• 11. If the vehicle with mass m runs on the straight road with constant power P, if the vehicle runs at constant speed V1, when the vehicle's speed is V2 (V2 < V1), the acceleration of the vehicle is () A. Pmυ1B. Pmυ2C. P(υ1−υ2)mυ1υ2D. Pυ1υ2m(υ1−υ2)
• 12. When a car is driving on a straight road, its acceleration direction is the same as the speed direction A. The speed of the car also decreases. B. the speed of the car is still increasing. C. when the acceleration decreases to zero, the car is stationary. D. when the acceleration decreases to zero, the speed of the car reaches the minimum
• 13. A 20 m long truck and a 6 m long car are driving at a speed of 20 m / s on a straight road at a constant speed. The distance between the two cars is 25 M. at present, the car overtakes at an acceleration of 0.5 m / S2. The car does not enter the lane from the overtaking lane until it exceeds 30 m of the truck
• 14. The bus departs from the station and runs at a speed of 4 m / s along the straight road at a constant speed. Two seconds later, a motorcycle departs from the same station to catch up at a constant speed The acceleration is 3m / S & sup2;, Q 【1】 How long does it take for the motorcycle to catch up with the car? 【2】 How far is it from the starting point when the motorcycle catches up with the car
• 15. A. Two cars B drive in the same direction on the straight road. Car a moves at a constant speed at the speed of VA = 20m / s, and car B moves at a constant deceleration straight line at the initial speed of vb0 = 24m / s, with the acceleration of a = 2m / S2. If car B is at △ s = 165m in front of car a, how long does it take for the two cars to meet? A student has the following solution: let two cars meet at the passing time t, then SA = VAT, sb = vb0t-12at2, SA = sb + △ s, The value of t can be obtained by combining the above formulas with the data. Do you think the student's solution is reasonable? If it is reasonable, please continue to calculate the time t; if not, please use your own method to calculate the correct result
• 16. There is a bicycle 120 meters ahead of the car moving at a constant speed of 6 m / s, and the car is catching up with the bicycle at a speed of 18 m / s. if two cars are moving in a straight line in the same direction on different lanes of the same road, the following questions can be found: (1) how long will it take for the two cars to meet for the first time? (2) If the car brakes immediately after catching up with the bicycle, and the acceleration during the braking process is 2m / S2, how long will it take for the two cars to meet for the second time?
• 17. A. B two cars are driving in the same direction on the straight road. A car has been moving at a constant speed of 20 m / s. when B car is 80 m in front of a car, B car's speed is 4 m / s, and it is moving at a constant deceleration with an acceleration of 2 m / S2? （　　） A. 4sB. 4.2sC. 5sD. 20s
• 18. When the speed reaches 12m / s, the elevator starts to make a uniform linear motion. After 4S, the elevator stops. Calculate the height of the elevator and the average speed in the process of rising
• 19. The elevator starts to move in a straight line with a square acceleration of 2m / s from standstill, changes to a uniform motion after 3S, changes to a uniform deceleration motion after 7S, and stops after 2S 1. How fast is the elevator moving at a constant speed? 2. What is the acceleration during deceleration? 3. What is the average speed of acceleration and deceleration? Complete the formula
• 20. Urgency: a person can lift up to 100kg on the ground. When he rises in the elevator at a constant speed with an acceleration of a = 2m / s, he can lift up to 100kg Urgency: a person can lift up to 100kg of objects on the ground. When he rises in the elevator with a square acceleration of 2m / s, how many kg of objects can he lift? When he falls in the elevator with a square acceleration of 2m / s, how many kg of objects can he lift? (G = 10m / s Square)