1. How much work is done in lifting an 8-kg box from the floor to a height of 2m above the
floor?

The amount of work done in lifting this box is equal to 156.8 Joules.

Given the following data:

Scientific data:

To calculate the amount of work that is done in lifting this box:

Mathematically, the work done by a person is calculated by using this formula:

Where:

Substituting the given parameters into the formula, we have;

Work done = 156.8 Joules.

Read more on work done here: link

156.8 Joules

Explanation:

Work = Force x Displacement

Displacement = 2m

Force (force of gravity) = mass x acceleration due to gravity =  8Kg x 9.8m/s^2

= 78.4N

Work = FxD

Work = 78.4 N x 2m

Work = 156.8 N·m  OR 156.8 Joules

d. air pressure decreases as altitude increases.