A 15.0 kg child on a 1.00 m long swing is released Physics more in details?

[Jay]

A 15.0 kg child on a 1.00 m long swing is released from rest when the ropes of the swing make an angle of 33.0° with the vertical.
(a) Neglecting friction, find the child's speed at the lowest position.
__________ m/s
(b) If the speed of the child at the lowest position is 1.60 m/s, what is the mechanical energy lost due to friction?
___________J

[Jeni P]

okay, a 1m long swing at 33 degrees represents a lift of how high? because then, the child has a potential energy.... right?
so, neglecting friction, if all that potential energy is transofrmed into kinetic, how fast is the child going...

now that you havbe the answer to a, the kinetic energy to b is? the difference (lost to friction) is therefor?