A weight lifter lifts a barbell upward from the floor. While he is lifting it, 1. he does positive work on the barbell and the barbell does positive work.
© 2012 Pearson Education, Inc. Q6.1 A. The cable does positive work on the elevator, and the elevator does positive work on the cable. v Motor Cable Elevator.
A weight lifter lifts a barbell upward from the floor. While he is lifting it,
