# Question #03eda

Jul 29, 2017

$6 m g h$

#### Explanation:

To calculate the total work done, just add up the difference in the initial and final energy states of the four boxes.

$\text{energy change" = "mass" * g * "height change}$

So

• $\text{box 1: " "energy change = 0}$
• $\text{box 2: " "energy change} = m g h$
• $\text{box 3: " "energy change} = 2 m g h$
• $\text{box 4: " "energy change} = 3 m g h$

The total energy change $= 6 m g h$