部落格

標題:

問PHY 2001 CE MC Q.1 and Q.2

發問:

問PHY 2001 CE MC Q.1 and Q.2 可唔可以解釋下個答案問黎?

最佳解答:

• 下面d方程點做-(問y係咩)
• 飛天小女警Z主題曲
• Solve 2 - x - 3x^2 < 0 .

 

此文章來自奇摩知識+如有不便請留言告知

1. The answer is B. For A, the speed of the car in a distance-time graph is the slope of the line. So, the slope has not changed, so the speed does not change. For B, the distance from P of the car is decreasing. So, the car is moving towards P. For C, The car is moving with a uniform velocity. So there is no acceleration. So, by F = ma, the force acting on the car is balanced. For D, The area has no physical meaning. It is the area in a velocity-time graph refers to the total distance. For E, It is explained in A. 2. The answer is C. Let d m be the distance between A and B. So, time required from A to B = d/1 = d s Time required from B to A = d/2 s So, total distance = 2d m Total time = d + d/2 = 3d/2 s So, average speed = distance / time = 2d / (3d/2) = 4/3 = 1.33 m/s

其他解答: