If a body has no force acting on it and its weight is constant (no friction), its speed will remain constant. According to Newton's first law of motion, an object at rest will stay at rest, and an object in motion will continue moving with a constant velocity (which includes both speed and direction) unless acted upon by an external force.
In this case, since there is no force acting on the body and its weight is constant (no friction), there are no external forces to change its velocity. Therefore, the body will maintain its speed and continue to move at a constant speed.