Natural Science
Undergraduate
為什麼是這樣？
Em
下列各方程式是描述一個質點在 4 種情形下的位置函數 x(#) (每一
個方程式中的xz 以公尺為單位,/以秒為單位,且> 0:(0Dx7
3-2:2)z和4 327)二27;(0xz= 一。(a)在那些情況f:
物質的速度y RE ?(b)那一個的y值是在負x之方向上?
YU 讓
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