C14: In which of the following processes the most work is performed:

1) A light suitcase (m=8kg) is held at a constant position of 0.5 m above the ground.

2) A heavy suitcase (m=30kg) is held at a constant position of 0.5 m above the ground.

3) A pen (m=10g) is lifted to a height of 1 cm.

4) A brick (m=1kg) is lifted to a height of 1 m.

5) The work done is the same for all processes.