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 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.
KE=1/2 M V^2
i might be missing an equation here
The Attempt at a Solution
i was thinking that potential energy gravitational would turn into Kinetic energy then i solved for v.
PEg= 427 newtons*.66 i used the change in height for h and got 281.82 Joules for my answer. then i said that should transfer to KE.
281.82 joules= 1/2* 427/9.8 Kg * V^2 and i got 11.3737 m/s as my answer. when i checked this it turned out to be wrong. i think i may have to apply circular motion concepts to this problem, but i'm not quite sure how to do that.
thanks in advance.