6. A person lifts a package weighing 75 N. If she lifts it 1.2 m off the floor, what is the packages potential energy?

90J

Explanation:

Given parameters:

Weight of package  = 75N

Height  = 1.2m

Unknown:

Potential energy  = ?

Solution:

Potential energy is energy due to the position of a body. It is mathematically expressed as;

  Potential energy = mgh

m is the mass

g is the acceleration due gravity

h is the height

       The weight is mg

 Potential energy  = 75 x 1.2 = 90J

the total distance that martina travels that day is

(distance from home to mom's office) plus (distance from mom's office to school)

plus (distance from school to library) plus (distance from library to friend's house)

plus (distance from friend's house to martina's house).

(we don't know what any of these distance actually is.)