Question

Raising 145kg, 21600j of work. How high is it raised?

Answer 1

Given,

The mass, m=145 kg

The work done, W=21600 J

The work is the measure of energy transfer through the application of external force to move an object.

The work done is given by,

`W=\Delta PE=mg\Delta h`

Where ΔPE is the potential energy, g is the acceleration due to gravity, and Δh is the change in the height of the object.

On rearranging the above equation,

`\Delta h=(W)/(mg)`

On substituting the known values,

`\begin{gathered} \Delta h=(21600)/(145*9.8) \\ =15.2\text{ m} \end{gathered}`

Thus the object was raised through a height of 15.2 m