Question: What is the work done by a weightlifter when he lifts a 4 5 kg barbell 1 . 7 5 meters above the floor? (

What is the work done by a weightlifter when he lifts a 45 kg barbell 1.75 meters above the floor? (Hint: First find the force, remembering g =10 m/s?) What is the gain in gravitational potential energy of the barbell?

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