I need help with these questions, for the first I thought the waork was zero rig

Question

I need help with these questions, for the first I thought the waork was zero right. Also I am just confused on the first and second.

Thank you!

Question 1 O out of 1 poin While lifting a barbell over your head (just the lifting part, not the lowering part that inexorably follows) the change in gravitational energy. Selected Answer: is zero is zero is greater than the magnitude of the change in chemical energy is equal to than the magnitude of the change in chemical energy is less than the magnitude of the change in chemical energy Answers: Question 2 O out of 1 poin While climbing stairs at a constant speed what form(s) of energy increase(s)? (Select all that apply) Selected Answers: Gravitational potential Answers: Kinetic Chemical Thermal Gravitational potential Question 3 0 out of 1 poin What's another name for the magnitude (absolute value) of the change in chemical energy? Selected Answer: energy output energy output efficiency power output metabolic energy Answers:

Explanation / Answer

Question 2) while climbing stairs at a constant speed kinetic energy doesn't change since speed is same.

Height from ground increases so gravitational potential energy increases.

Question 3) another name of change in chemical energy is metabolic energy.

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