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A worker is carrying bricks of mass $M kg$ to a height of $h metre$ from the ground level through a staircase. What is the work done by him?

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Mgh

\frac{1}{2} M v^{2}

Mh

0

answer is A.

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Detailed Solution

The work done by the worker taking a mass of

M kg

to a height of

h metre

from the ground level through a staircase is

Mgh .

The work done by a body due to its position from the ground is defined as the potential energy of the object. Therefore, the work done by the potential energy for the body to move up a distance of

h metre

with a weight of

M kg

is given by

W = weight of the body \times height through which the body has been lifted

W = Mg \times h

Therefore the work done by the body is

Mgh

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