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## Main Question or Discussion Point

Many books teaching relativity at the introductory level,go on and say that relativistic momentum cant be described using p=mv

and p=m Dx/Dt(D is Delta)

also

it says the measure Dx is the same as measured by the both people.One who is measuring his own momentum and another who is measuring the moving person's(with respect to him) momentum.

I get confused.how can this be?

and p=m Dx/Dt(D is Delta)

also

it says the measure Dx is the same as measured by the both people.One who is measuring his own momentum and another who is measuring the moving person's(with respect to him) momentum.

I get confused.how can this be?