IN_A_LIFTING_MACHINE,_THE_EFFORT_REQUIRED_TO_LIFT_LOADS_OF_200N_AND_300N_WERE_50N_AND_60N_RESPECTIVELY._IF_THE_VELOCITY_RATIO_OF_THE_MACHINE_IS_20_DETERMINE_EFFORT_LOSS_IN_FRICTION_AT_200_N.?$

• A. 30 N
• B. 35 N
• C. 40 N
• D. 45 N