Four free-body diagrams of a block on a ramp are shown.Match

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Four free-body diagrams of a block on a ramp are shown.Match each diagram to a situation.E.g.,if diag.1 corresponds to situation D,diag.2 to situation B,diag.3 to E and diag.4 to A,enter DBEA.You have only 4 tries!
A block is sliding down a ramp at increasing speed.
A block is being dragged up a ramp.
A block is momentarily at rest; it is changing directions - after sliding up a ramp,it is about to slide back down.
A block is stationary on a ramp.
A block is sliding down a ramp at decreasing speed.
A block is sliding up a ramp.

3.运用：一类是来应付考试,另一类则是来解释身边得一些物理现象. 所以,在学习时,首先,不要有惧怕的心理,因为你前一段没学好的经历可能会暗示你什么

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