A boy has a bag of sand of mass 20kg. first of all, he keeps the bag on his head and move 10 metre. Second time, he drags the bag through 10 metre on a frictionless surface. Inwhich case, he does more work.

A boy has a bag of sand of mass 20kg. first of all, he keeps the bag o

1.	A boy has a bag of sand of mass 20kg. first of all, he keeps the bag on his head and move 10 metre. Second time, he drags the bag through 10 metre on a frictionless surface. Inwhich case, he does more work.
Answer» tion:The boy is MOVING making an angle of 90 degrees with the DIRECTON of application of gravitational force(Force of gravity acts in the downward directon)So, total work DONE by man: -F × S cos ¢(THETA)20 × 10 cos 90As cos 90= 0So, F×S cos ¢=0Hence total work done by man is ZERO.Read more on Brainly.in - brainly.in/question/8248871#readmore

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A boy has a bag of sand of mass 20kg. first of all, he keeps the bag on his head and move 10 metre. Second time, he drags the bag through 10 metre on a frictionless surface. Inwhich case, he does more work.​

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A boy has a bag of sand of mass 20kg. first of all, he keeps the bag on his head and move 10 metre. Second time, he drags the bag through 10 metre on a frictionless surface. Inwhich case, he does more work.