Answer:
300 J
Step-by-step explanation:
The gravitational potential energy of the performer is given by:

where
(mg) is the weight of the performer, equal to the product between mass (m) and gravitational acceleration (g)
h is the height of the performer above the ground
In this problem, we have
(mg) = 60.0 N
h = 5.0 m
Substituting into the formula, we find
