Forces and Potential Energy Practice Test

A $2,\text{kg}$ ball is held at three different heights above the ground: Position 1 at $0,\text{m}$, Position 2 at $2,\text{m}$, and Position 3 at $4,\text{m}$. Assume $g \approx 10,\text{N/kg}$. Which statement correctly connects the direction of the gravitational force to gravitational potential energy and work?​

A student lifts a backpack of mass $5,\text{kg}$ from the floor to a shelf $1.5,\text{m}$ high at constant speed. Take $g \approx 10,\text{N/kg}$.

Which statement correctly describes the work and the change in gravitational potential energy of the backpack?