# Physics

A father pulls his son, whose mass is 26.7 kg and who is sitting on a swing with ropes of length 3.27 m, backward until the ropes make an angle of 35.6° with respect to the vertical. He then releases his son from rest. What is the speed of the son at the bottom of the swinging motion?

I'm just wondering what formula I can use in order to find the answer

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1. just did it below
kinetic energy at bottom = potential energy at top

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2. Formula? You have to do some thinking.

draw the diagrem.
Calculate the height off ground the swing is at the start position:
L=3.27-3.27cos35.6

calculate the starting PEnergy
mass*g*startingHeight

Calculate velocity from
final KE=initial PE
1/2 mv^2=mgh
solve for v.

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bobpursley

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