posted by josh .
Betty weighs 427 N and she is sitting on
a playground swing seat that hangs 0.22 m above the ground. Tom pulls the swing back and releases it when the seat is 0.88 m above the ground.
The acceleration of gravity is 9.8 m/s2.
Betty is moving 3.5967 m/s when the swing passes through its lowest position.
If Betty moves through the lowest point at 0.6 m/s, what is the magnitude of the work done on the swing by friction?
Answer in units of J