Question

. Find out the sign of work done in the

following cases: (2)

a) Work done by a man in lifting a bucket

out of well.b) Work done by friction on a body sliding

down an inclined plane.

c) Work done by an applied force on a

body moving on a rough horizontal

surface.

d) Work done by the resistive force of air

on a vibrating pendulum​

Answer 1

Answer:

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