Symbolic calculation, units and programs in MP3.0

When using ranges, if you use units, all elements must have units. If you use units, you must indicate the step size

for 0g to 10g by steps of 1g (but you can make it smaller if you want).

By the way, if you don't use units and don't specify step size, the default step size will be used (and it is 1).

1) What do you think that "unit" g should be? In Mathcad g is the constant of gravity (unless you redefine it), no matter if you label it as constant or as unit. If you want grams you should write gm.

2) When defining range variables with units, you have to provide the second value and to add units allover.
like: 0gm,1gm..10gm

Your second exampled worked because when you set up x e 0 .. [anything] you define a unitless scalar range with step 1. In my opinion the endvalue should throw an error as in your case its 10 g = 98.067 m/s^2 but it doesn't. Instead the loops goes up to 98 and the result you get is f(98,5).