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I believe he is doing work because he applied force, the object was displaced and theres effort that has to be done to lift up a barbell.

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He is applying force so yes he is doing work .

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I believe that he is doing work because he’s applying force unto the barbell and it’s being displaced up and down.

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He is doing work because a force is being applied in order to displace an object.

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I believe that he is doing work because he is applying force when he squats and then applies force when he goes back up.

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Yes he is using force to carry the barrel on his back

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I believe he is doing work because he applied force and displaced the weight in the same direction as the force.

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i believe hes doing work bc force is being applied to him from the object

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Yes, a force is being applied, thus doing work.

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yes he is doing work because he is applying a upwards force and changing the position of the bar

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Yes, because there was force applied and it did case displacement

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Yes I think he is doing work because there is displacement and force

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Yes because not only is there a force being applied, but the location of the object is displaced as well

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Yes work is being down it is being lowered but a force is still applied

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The support of the arms holding the force of the barbell demonstrates work.

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Yes, he is doing work because he is applying force to an object.