Question
Tue January 31, 2012 By: Shreya Mukherji

if a porter is holding a bag and climbing a ladder then what is the work done by the porter on the bag?

Expert Reply
Wed February 01, 2012
if the ladder is vertical then the work done= mgh     h=height raised.
if the ladder is inclined,then also,
after iot is raised by a certain ht  h the work done=mgh
and these are the work done by the porter against the gravitational pull of earth.so negative and stored as PE in it.
but if the porter moves horizontally, then W=0, as grav force and displacement making 90 angle.
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