PHYSICS PLEASE HELP
posted by Holly on .
A 80 kg child sits in a swing suspended with 2.6 mlong ropes. The swing is held aside so that the ropes make an angle of 46 o with the vertical. Use conservation of energy to determine the speed the child will have at the bottom of the arc when she is let go.

(M/2)Vmax^2 = M g L(1  cos46)
L(1 cos 46) is the maximum rise of the swing above the bottom position, where the velocity is Vmax
Vmax = sqrt[2 g L (1cos46)] 
does 1cos46 represent L or is L part of that equation?

L is the rope length, and is part of the equation. I already told you what
L*(1 cos 46) is .