Answer:
ΔU=7.84 J : Potential energy added to the vase
Explanation:
Conceptual analysis
Potential Energy (U) is the energy of a body located at a certain height (h) above the ground and is calculated as follows:
U = m * g * h
U: Potential Energy in Joules (J)
m: mass in kg
g: acceleration due to gravity in m/s²
h: height in m
Equivalences
1 N = 1 (kg×m)/s²
1 J = N × m
Known data
m = 4kg
g=9.8 m/s²
h₁=1,2 m
h₂=1.4m
Problem development
Potential energy added to the vase =ΔU
ΔU: Potential energy change
ΔU = U₂ - U₁
ΔU = m*g*h₂ - m*g*h₁
ΔU = m*g*(h₂ - h₁)
ΔU = 4*9.8*(1.4 – 1.2)
ΔU=39.2*(0.2) ΔU=7.84 J : Potential energy added to the vase
