Duduli

Answer:- The reference frame in which one body is initially at rest and other body approaches it so that collision takes place is called laboratory frame of reference.

Answer:- A system of coordinate axes which defines the position of a particle or an event in two or three dimensional space is called frame of reference. ★The simplest frame of reference is Cartesian system of coordinates.

Answer:- A frame of reference is said to be inertial   frame of reference either it move with constant velocity or is at rest with respect to a fixed frame. ★In inertial frame Newton's laws are valid.