Question

what is inertial frame

Answer 1

A frame of reference that moves with constant velocity with respect to an inertial frame is also an inertial frame. For example: Newton's laws work in the physics lab, which is fixed to the Earth. Therefore they also work in a train moving with constant velocity with respect to the Earth.

Answer 2

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HERE IS YOUR ANSWER,

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An inertial frame of reference (or Galilean reference frame) is a frame of reference in which Newton's first law of motion applies. All inertial frames are in a state of constant, rectilinear motion with respect to one another; they are not accelerating.

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