問題詳情

4.A 50-lb block is acted upon by an 80 lbs force as shown in Figure 4. If the block is initially at rest, determine its velocity after it has traveled a distance of 10 ft. Assume coefficient of kinetic friction between the block and the plane to be 0.2. (30%)

參考答案

答案：B
難度：簡單0.727873
統計：A(42),B(1653),C(18),D(382),E(0)

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【張家榛】評論

+1

【Peggy Chen】評論

自我語言(獨語)增進自我理解與自我溝通上的認知。

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"(D)幼兒遊戲時的自言自語，反映了自我中心的認知特性"是Piaget前運思期的主張