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## Homework Statement

Tarzan swings on a 34 m long vine initially inclined at an angle of 41 degrees with the vertical.

The acceleration of gravity is 9.81 m/s^2.

What is his speed at the bottom of the swing if he starts from rest?

What is his speed if he pushes off with a speed of 4 m/s?

## Homework Equations

w=(f)(d)(cos theta)

w= KEF - KEI

## The Attempt at a Solution

I got the work, but how can you possibly find out his speed if a mass is not given? I'm thinking that it might have something to do with the kinetic energy equation, but you need mass for that. I'm not really sure of what to do now. I have a similar question like this, but with a loop-the-loop, which also does not give a mass. Someone please help!