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35. A block of mass 2 kg on a table is pushed by a force of 20 N directed with an angle of 30o downward 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 acceleration g = 10 m/s2)

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



【已刪除】35. A block of mass 2 kg on a table..-阿摩線上測驗