Question

The floor of the basement of a house is 3.0 m below ground level, and the floor of the attic is 5.0 m above ground level. What is the change in potential energy if a 2.0 kg object in the attic is brought to the basement

Answer 1

:

change in potential energy , ∆Ep = 156.8Joules

Explanation:

Given;

Mass of object , m = 2.0 kg

Heights ; h₂ = 5.0m

h₁ = - 3.0m

To obtain

the change in potential energy, ∆Ep = ?

But,

∆Ep = mg∆h

Where;

m is the mass of the object (kg)

∆h = h₂ - h₁ is the change in height (m)

g is the acceleration due to gravity ( 9.80 m/s²)

Therefore,

the change in potential energy, ∆Ep = 2.0 × 9.80 × ( 5 - (- 3))

=156.8 joules