Yahoo奇摩 網頁搜尋

  1. ... on at this constant velocity of 25 ms⁻¹ for 10 sec, Then, it decelerates at -25/(25-15) = -2.5 ms⁻², until it stops after another 10 sec. ...

  2. ...should first find the distance traveled by the lift when it accelerate and decelerate , by s = ut+0.5at^2 whwn the lift accelerate, the distance it travel...

  3. ...when accelerated to a certain speed, moves at a uniform speed before it decelerates when reaching the next station. Since the man stands without...

  4. ...ma =>R-mg= m(a') =>R=mg+ma' > mg Case 3 : decelerating F=ma =>R-mg=m(-a') =>R=mg-ma'<mg...

  5. ...distance First find the thinking distance by s = vt. As the car decelerates at a uniform rate, we can apply the equations of motions to calculate...

  6. ... cycling uniformly, d = 9 X 6 = 54 m So, the distance to decelerate , s = 108 - 54 = 54 m By s = (u + v)t / 2 54 = (9 + 0)t / 2 Time...

  7. 1) false when the object is decelerating , the velocity will be positive but the acceleration will be negative, in this situation, the direction...

  8. ... the car first accelerates uniformly from rest at a, and then decelerates uniformly at -a. By symmetry, the time taken during the acceleration stage and...

  9. ... oppsite tothe direction of motion of the car. By -f=ma,a=-f/m,thus the car decelerates . Also as the car is decelerating ,the car get hot as the work...

  10. a , I would choose the initial direction as positive direction while the decelerating direction as the negative direction b, <---- Acceleration 2...