物理
高中
想問這幾題🙏（第2想問D）
2. 一個質點作直線運動,其a-1關係式為a=6-31,若x=0時x = 0、vg=18m/s,則下列敘
述何者正確?
(A) 在第2秒時,質點開始反向運動
(C) 最大正向位移為6公尺
(E) 從第2秒後物體之加速度與速度恆反向。
(B)最大正向速度為24m/s
(B)4到6秒間之平均加速度為-9m/s?Q=
V V6-V4
6-4
挑戰一:某連隊等速直線前進,部隊全長 600m,傳令兵自隊尾等速跑到隊首遞交報告給連長後,
立刻以原速率跑回隊尾,此時整個連隊恰好前進了800m,則全程傳令兵移動的路徑長為?/600m
# A popular web video shows a jet airplane, a car, and a motorcycle racing from rest
along a runway. Initially the motorcycle takes the lead, but then the jet takes the lead,
and finally the car blows past the motorcycle. Here let's focus on the car and motorcycle
and assign some reasonable values to the motion. The motorcycle first takes the lead because
its (constant) acceleration am 8.40 m/s² is greater than the car's (constant)
acceleration ac 5.60 m/s², but it soon loses to the car because it reaches its greatest
speed 58.8 m/s before the car reaches its greatest speed y 106 m/s. How long does
16.6
the car take to reach the motorcycle?
解答
您的問題解決了嗎？
我也跟你算的一樣，但老師答案給D