問題詳情

35. A block of mass 2 kg on a table is pushed by a force of 20 N directed with an angle of 30odownward from the horizontal as shown in the figure. The kinetic frictional coefficient is 0.2.What is the work done by the frictional force after traveling 10 m long? (Gravitational accelerationg = 10 m/s2)


(A) 10 J
(B) 30 J
(C) 40 J
(D) 50 J
(E) 60 J

參考答案

答案：E
難度：計算中-1
書單：沒有書單，新增