Question

Define point mass body ??????

Answer 1

An object can be consist as a point object during motion in a given time it covers distance much greater than its own size

Answer 2

Point mass (pointlike mass) is the concept, for example in classical physics, of a physical object (typically matter) that has nonzero mass, and yet explicitly and specifically is (or is being thought of or modeled as) infinitesimal (infinitely small) in its volume or linear dimensions