問題詳情

38. A 2-kg block slides down a frictionless incline from point A to pointB. A force (magnitude P = 3 N) acts on the block between A and B,as shown in the figure Points A and B are 2 m apart. If the kineticenergy of the block at A is 10 J, what is the kinetic energy of theblock at B? (Gravitational acceleration g = 10 m/s2)


(A) 17 J
(B) 20 J
(C) 24 J
(D) 27 J
(E) 37 J

參考答案

答案：C
難度：計算中-1
書單：沒有書單，新增

用户評論

【面試倒楣鬼-22幸運上後西】評論

= 10 +mgh - 3*2  = 10 + 2*10*1 - 3*2 ...