A student lifts a school bag from the ground and puts it on his shoulders 1.5m above the ground. A force of 5N is acting on an object. Calculate the work done by him on the school bag.

w = 7.5 [J]

Explanation:

We must remember the definition of mechanical work, which tells us that work is equal to the product of force by distance. This force must be applied in the direction of movement. So we have the following equation:

w = F*d

where:

w = work [J]

F = force [N]

d = distance [m]

Now replacing we have:

w = 5*1.5

w = 7.5 [J]

the independent variable, or the one that is intentionally manipulated is the speed.

double the distance = divide strength by 4