A person slowly lifts a block of mass m through a vertical height  h, and then walks horizontally a distance  d while holding the block. What is the total work done by the person?                                                                                                                    

Dear student 
Total work done by person is against the gravity and moving horizontal  distance d 
The work done by person against gravity is -mgh
‚Äčand the work done by person in moving distance d is 0 since angle between force and displacement  90 degree.
Hence Wtotal= -mgh+0=-mgh

 

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