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# Answer to Question #58094 in Mechanics | Relativity for Christbeauty

Question #58094
1 A stationary observer at a railway station sees a passenger in a railway coach that is in motion at constant speed in a straight and horizontal track. Which of the following best describes the frames of reference from which both the observer and the passenger describe each other's motion?
inertial
uniform
constant
relativistic

2 Consider the two observers O and
O′
at the origins of the frames of reference
S
and
S′
respectively, which are in relative motion at constant velocity
v
along the x-axis as illustrated in figure TMA 1_Fig1. Suppose the origins
O
and
O′
as well as the axes of the coordinates of these frames are coincident at an initial time
t=t′=0
. The two observers are equipped with measuring instruments to determine the coordinates of the event at P. Measurements made in the
S
frame are related to those made in the
S′
by the following EXCEPT
x′=x−vt
y′=y
t′=t
z′=z+vt

3 The joule (J) is the same as
kgm−1s−2
kgm−2s−1
kgm2s−2
kgms−1

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