Defining variables for solve

I would like to point out that there is an easier and better way to define W1.  Rather than manually enter 9.81 for the gravitational acceleration, Mathcad includes g as a constant.  So, I suggest you do this:

This way, your mass data is entered as data (rather than just a number) and you let Mathcad handle the math and units.

Terry already said that 'vectorization' does the magic here.

Its often a good idea to turn the calculations into functions which expect single scalars as arguments and after defining the input vectors call this function vectorized:

I wouldn't necessarily vote for it now, but you can also execute the vectorization in the function and then don't have to think about vectorization when calling it: