force energy=initial PE-finalKE-final PE
= 20.2*9.8*6.12-1/2 20.2*8.7^2 - zero assuming the final height is zero.
A child of mass 20.2 kg takes a ride on an irregularly curved slide of height 6.12 m. The child starts from rest at the top. The acceleration of gravity is 9.8 m/s2 .
If a frictional force acts on the child, what is the magnitude of the mechanical energy dissipated by this force, if the speed of the child at the bottom is 8.7 m/s?
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