Posted by **brian** on Wednesday, February 20, 2013 at 11:42am.

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.

How fast is Betty moving when the swing

passes through its lowest position?

Answer in units of m/s

Answer= 3.5967m/s

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

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