Betty weighs 425 N . She is sitting on a playground swing seat that hangs 0.47 m above the ground in its rest?

C

cloudysky274

New member
Betty weighs 425 N . She is sitting on a playground swing seat that hangs 0.47 m above
the ground in its rest position. Her initial
speed is zero and her initial height above the
ground is 1.34 m . At some later time her
speed is 1.04 m/s and her height above the
ground is 0.7 m .
The acceleration of gravity is 9.8 m/s
2
.
Assume: There is friction.
What is the magnitude of the work done by
friction durning this time?
Answer in units of J


Thanks
 
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