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A potter moving vertically up the stairs with a suitcase on his head does work . why ?

Physics
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try it by ur own...I'll help u
but i dont know and that is why i asked this question , give me the hints :)
and if you dunt mind can you teach me all types of questions like dis ?

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Other answers:

1st make a block of mass m as I did in last question...
|dw:1348895105918:dw|
and coolie is holding it on his head...right?
yes right !
now u have to tell...who or what is exerting force on this load?
1st earth is pulling towards its center by force mg..right?
N
YES
|dw:1348895307961:dw|
and u have to find out..work done by the potter?
and the potter is exerting a force N on the load and the direction of force is vertically upward.
again work done by potter= Force. displacement = N *( displacement) * cos(theta)
vertical so cos 0 = 1
now this time u have to tell the value of theta if potter is moving vertically up
yes...perfectly right...:)
so potter has done some work...because work done is not equal to zero
yeah , okay ty :D
:)

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