When an object moves in a straight line with constant speed, its velocity is 3 m · S-1 at a certain time, and 9 m · S-1 after 1 s A. The displacement may be less than 5MB. The displacement may be less than 3mc. The acceleration may be less than 11m · s-2d. The acceleration may be less than 6m · S-2
A. If the velocity at the end of 1s is the same as the initial velocity direction, the displacement within 1s is x =. VT = V1 + v22t = 3 + 92 × 1m = 6m. If the velocity at the end of 1s is opposite to the initial velocity direction, the displacement within 1s is x =. Vt = V1 + v22t = 3 + (− 9) 2 × 1m = − 3M
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- 8. The car runs at a speed of 15 meters per second, and starts to brake from a certain moment. After braking, the car moves in a straight line with uniform deceleration, and the acceleration is 6 meters per square second When the car runs at a speed of 15 meters per second, it starts to brake from a certain moment, and then makes a uniform deceleration linear motion. If the acceleration is 6 meters per square second, the displacement of the car in 3 seconds after braking is?
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- 16. When an object is moving in a straight line with uniform acceleration, the average speed of the first half of the displacement is 3m / s, and the average speed of the second half is 6m / s, what is the speed when it passes through the middle position?
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