A box is being pulled upwards by a force with an acceleration of 4 m/s². Assuming the box is being pulled vertically upwards in a region where the gravitational acceleration is 9.81 m/s², calculate the net acceleration of the box.

Concept:​

​The free body diagram is 

The gravity acts downward and Force is applied upward.

The net force on body will be:

\(m\vec{a}=\vec{F}-m\vec{g} \\ \vec{a}=\frac{\vec{F}}{m}-\vec g\\ \vec{a}=4-9.81\\ \vec{a}=-5.81\ m/s^2\)

The net acceleration will be downward.

The correct option is 3). 5.81 m/s².