Answer: 176.4 Joules
Explanation: Potential energy of a body is defined as the energy possessed by virtue of position.
Potential energy [tex]=m\times g\times h[/tex]
m = mass of the body = 6 kg
g = acceleration due to gravity = [tex]9.8 ms^{-2}[/tex]
h = height of body = 3 m
Potential energy [tex]=6 kg\times 9.8ms^{-2}\times 3m=176.4kgm^2s^{-2}[/tex]
= 176.4Joules {[tex]1kgm^2s^{-2}=1Joule[/tex]}