Rani picks up her school bag of mass from the ground and places it on her shoulder…
PHYSICS · Multi-part · CBSE · Physics · Work and Energy · Work and Energy
Problem
Rani picks up her school bag of mass 5kg from the ground and places it on her shoulder 1.2m above the ground. She then walks straight to her bus stop, holding the bag steadily at the same height, covering a horizontal distance of 60m. (Take g=9.8ms−2.)
(i) Calculate the work done by Rani on the bag while lifting it to her shoulder.
(ii) Calculate the work done by Rani on the bag while she walks to the bus stop.
(iii) Find the total work done by Rani on the bag for the entire trip described above.
(iv) State the nature of work (positive, zero or negative) in each part and give a brief reason for your answer.