Given that mass of the chair is m = 4 kg.
The height of the chair from the ground is h = 2m.
The time is t = 3 s.
We have to find the power required.
In order to calculate power, first, we need to calculate the work done.
The work done is given by the formula
[tex]W\text{ =mgh}[/tex]
Here, g =9.8 m/s^2 is the acceleration due to gravity.
Substituting the values, the work done will be
[tex]\begin{gathered} W=4\times9.8\times2 \\ =78.4\text{ J} \end{gathered}[/tex]
The power can be calculated by the formula
[tex]P=\frac{W}{t}[/tex]
Substituting the values, the power will be
[tex]\begin{gathered} P=\frac{78.4}{3} \\ =26.13\text{ W} \end{gathered}[/tex]
Thus, the power required to lift the chair is 26.13 W
