Question

A crane lifts a large cement slab weighing 2,200 n to a height of 15 m. what is the pe of the slab? remember, weight is measured in newtons (n), and is equal to mass times gravity.

Answer 1

Potential Energy is calculated through the equation,
                              PE = m x g x h 
where m is the mass, g is the acceleration due to gravity, and h is the height. Since, weight is equal to mass times gravity, PE may also be calculated through the equation,
                                  PE = W x h
Substituting the known values,
                                  PE = (2,200 N) x (15 m) 
                                  PE = 33,000 J