問題詳情
89. A 20.0 kg uniform plank is supported by the floor at one end and by a vertical rope atthe other as shown in the figure below. A 50.0 kg mass person stands on the plank adistance three-fourths of the length plank from the end on the floor. What is the tensionin the rope?
(A) 165.5N
(B) 265.5N
(C) 365.5N
(D) 465.5N