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» n dragging it on polished surfaceExplanation: because the angle between the displacement and FORCE is 90 DEGREE THUS cos 90 becomes ZERO and thus work done becomes zero

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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.