pablo prepares to lift a barbell. during which stage of the lift does pablo do work on the barbell?\nwhen he…

pablo prepares to lift a barbell. during which stage of the lift does pablo do work on the barbell?\nwhen he holds the barbell up above his head\nwhen he applies force to the barbell but has not moved it\nwhen he lifts the barbell from the floor to his chest\nwhen he lets go of the barbell and allows it fall to the ground

pablo prepares to lift a barbell. during which stage of the lift does pablo do work on the barbell?\nwhen he holds the barbell up above his head\nwhen he applies force to the barbell but has not moved it\nwhen he lifts the barbell from the floor to his chest\nwhen he lets go of the barbell and allows it fall to the ground

Answer

Brief Explanations:

Work is done when a force causes an object to move in the direction of the force. In the first two options, there is no displacement while in the last option, the force causing the motion is gravity, not Pablo. When Pablo lifts the barbell from the floor to his chest, he applies a force and causes a displacement in the direction of the force.

Answer:

when he lifts the barbell from the floor to his chest