Question

A bucket full of water weighing 40kg is lifted to a height of 40 m,by means of rope weighing 20kg . The work done is

Answer 1

we know,work＝potential energy＝mgh
so,work＝40*10*40＝4000 joule

Answer 2

work done = force * displacment*cos(theta) and also equal to the potential energy stored in pulling the bucket up
we have given mass 40(of bucket)+20(mass of rope)=60 and gravity=10
and heigth=40m
so potential energy=mgh
we get =24000j or 24 kjoule
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