Question

Mathematical formulation of first law of motion

Answer 1

At constant speed there is no acceleration. (f′(x)=v′=0=a)(f′(x)=v′=0=a) .If a=0a=0 then F=ma=0F=ma=0 and therefore no force acts on the object so the object will continue in the same direction, if any. This is only realistic in zero gravity(?)

Answer 2

it states that body at rest will remain at rest unless an outside force acts on it....