Question

a weight lifter holds an 800 Newton barbell over his head at a height of 6 meters.how much work does the weight lifter do on the barbell? ​

Answer 1

Answer:

work done is equal to force into displacement..

work done is equal to..=800×6×10..=48000.

the person is standing that's why the gravitational force is also applied..

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Answer 2

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Given:

Weightlifter holds barbell,

Force = 800 Newton

Height or distance moved or Displacement = 6 meter

To find:

Work done = ?

Solution:

Work done = Force × displacement

Work done = 800 N × 6 m

Work done = 4800 N. m or 4800 J

Required answer:

Thus, 4800 Joule work is done by weightlifter on the barbell

Knowledge booster:

# If displacement is zero then work done is zero

# Work done is the dot product of force and displacement. W = Fs cosθ

# Work done is always conservative as it depends only on initial and final point