Speed when swinging from a rope?

[Bigdane]

Tarzan swings on a 23.8 m long vine initially inclined at an angle of 36° from the vertical.

(a) What is his speed at the bottom of the swing if he starts from rest?
m/s

(b) What is his speed at the bottom of the swing if he starts with an initial speed of 2.22 m/s?
m/s

help please!
i have no idea how to do this ah!

 

[dnp33]

A)1/2 mv^2 = mgh
potential energy at the top = kinetic energy at the bottom of the pendulum.

B)1/2mv^2 + mgh = 1/2 mv^2
initial kinetic energy plus potential energy at the top = final kinetic energy at the bottom.

 

[Bigdane]

how do i factor in the angle?

 

[dnp33]

the angle has nothing to do with the energy, only in finding the height.

 

[Bigdane]

how do i use it to find the height?

 

[dnp33]

really basic trig.