Question

Gina pushes a book across a table at constant speed. Fatima lowers a book from a high shelf down to her waist, where it comes to rest. Isidra holds a book at her waist while carrying it up stairs. Jin holds a book at her waist while carrying it across the room at constant speed. Who does zero work on their book?

A. Gina

B. Fatima

C. Isidra

D. Jin

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A wheel initially spinning at 12 rad/s completes 6.8 rotations while slowing to a stop with constant angular acceleration. How long does the wheel take to slow to a stop?

A. 1.8 s

B. 2.5 s

C. 3.6 s

D. 7.1 s

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Answer 1

Ans (D) Jin

because Jin holds a book at her waist while carrying it across the room at constant speed. So, there is no horizontal net force and So, No horizontal work done. And since book remains at same height, So, there will be no work donr in vertical direction also.

Alright Dude, If that worked for you... dont forget to give THUMBS UP.(that will work for me!)

If I missed something feel free to leave a comment.
atleast before giving downvote.