Work

The work done to lift an object against gravity is given by the formula: Where: - (mass) - (acceleration due to gravity) - (height) Substituting the values: Thus, the correct answer is (A) 3000 J.

Concept: Work done in stretching a wire equals area under force-extension graph.

Step 1: Graph relation.
Force increases linearly from 0 to final value.

Step 2: Work done.

Concept:
• Internal energy depends only on temperature

Step 1: Isothermal process


Step 2: Other processes
Adiabatic, isobaric, isochoric involve temperature change. Final Conclusion:
Option (A)