Question

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and
A brick was lifted from the ground to a height
'h' in 3 different ways. In which case was the
work done against gravity maximum ?
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Tol
-
(1) Case A
(3) Case C
(2) Case B
-
B
JA) Equal in all 3 cases
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Answer 1

CORRECT QUESTION:

A brick was lifted from the ground to a height 'h' in 3 different ways. In which case was the work done against gravity maximum ?

• The options have been attached in the uploaded image.

Calculation:

First of all, we need to know a few facts about Gravitational Potential Energy and the work done against this field:

• Gravitational Force is a conservative force hence the total work done by the operator to move an object in this field gets stored into the body as Gravitational Potential Energy.

• Now, being a conservative force, the potential energy stored (and the work done) into the body does not depend upon the path through which the body has been moved.

• Instead, it depends upon the initial and the final positions of the body.

Now, coming to the Question:

• We can see that, in all the three cases the path through which the body is moved is different.

• However, the initial and the final position of the body is same for all the cases.

• Hence, the work done will be equal in all the three cases.

$\star$ Hope It Helps.