A child, starting from rest at the top of a 3.00-m tall slide, has a speed of 2.52 m/s at the bottom of the slide. What percent of the mechanical energy of the child-Earth system at the top of the slide remains when the child reaches the bottom of the slide?
A) 8.4%
B) 10.6%
C) 32.5%
D) 46.0%
E) It cannot be determined without knowing the mass of the child.