Inertial Frame Characteristics in Newtonian Mechanics

[Amith2006]

# In Newtonian mechanics, which of the following characteristics of a particle is the same in all inertial frames?
a)Speed
b)Velocity
c)Momentum
d)Impulse
Does Newtonian mechanics mean Classical mechanics?

 

[Doc Al]

Newtonian mechanics generally means non-relativistic Classical mechanics. (Classical as opposed to Quantum.)

So what do you think the answer is?

 

[chaoseverlasting]

Since the frame is non accelerated (inertial), speed of the particle should be constant in all frames. Velocity may change if the frame selected is in non accelerated motion. If velocity changes, then momentum will also change being m.v. I am not too sure about the impulse though.

 

[Hootenanny]

Since the frame is non accelerated (inertial), speed of the particle should be constant in all frames.

Why must this be the case?