- #1
Rahulrj
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Homework Statement
Two observers having identical instruments carry out identical experiments to study the motion of a massive particle. First observer concludes that the particle is moving in a straight line with constant velocity while the second observer concludes that the particle is moving with acceleration. Which of the following statements made about the observers are correct:
a) both observers are at rest
b) second observer is moving with constant velocity w.r.t the first observer
c) both observers are moving with constant velocity w.r.t to a distant star
d) second observer is accelerating w.r.t first observer
Homework Equations
##r_{ab} = r_a - r_b##
The Attempt at a Solution
To my reasoning, both observers can't be at rest or have constant velocity in the same frame because according to relativity laws of physics are same in all inertial frames. However if I assume them to be in different frames of reference it is possible they can make that observation being at rest w.r.t their reference frame but here ##a## is a blanket statement that doesn't make much sense to me. My immediate reaction to this question was statement ##d## but I am not sure if it is correct because I am not able to properly reason why the other statements might be wrong. So I would like to know about the cases made in each statement.