物理--contact in bodies(斜面題)

A. F = 2mg

Only one force act on the block, which is perpendicular to the incline surface, point to left top.
Let it be A (N)

Resolve A to two vectors: Acos45 (upword) and A sin45 (left).

As the block is stationary relative to the inclined body,
Two body is accelerating to the left governed by F = 2ma.

The block is also accelerating to the left.
Asin45 = ma ...... (1)

Acos45 = mg ....... (2)

a = g

F = 2ma = 2mg

點解你唔去借or 買本solution,咁就唔洗晒時間問了

2008-12-29 17:02:57 補充：
信我吧!真的有本solution的。呢本係mastering Advanced Physics 嘛，有solution 架

似A喎個答案 重2M
推動佢咪 2mg 好似唔關佢個斜面事