Answer:
14700 J
Explanation:
The gravitational potential energy of an object is given by:
[tex]U=mgh[/tex]
where
m is the mass
g is the gravitational acceleration
h is the height of the object above the ground
In this problem:
m = 50 kg is the mass of the hiker
[tex]g=9.8 m/s^2[/tex]
h = 30 m is the heigth of the cliff
Substituting, we find
[tex]U=(50)(9.8)(30)=14700 J[/tex]
