Question

An observer accurately measures the constant velocity of a car from her frame of reference. Another observer measures the constant velocity of the car from his frame of reference. If the two frames of reference are at rest with respect to each other, how will the velocity measurements compare?

a) Both observers will measure the same constant velocity.
b) The measurements will be different due to the frame of reference.
c) Only one observer can accurately measure the constant velocity.
d) It's impossible to determine without additional information.

Answer 1

Both observers will measure the same constant velocity.

Step-by-step explanation:

In this scenario, both observers will measure the same constant velocity.

According to the principle of relativity, if two reference frames are at rest with respect to each other, and an object is moving with constant velocity, then the measurements of the velocity made by observers in both frames of reference will be the same.

For example, if a car is moving at a constant velocity of 50 km/h according to one observer, then another observer in a different frame of reference, which is at rest with respect to the first observer, will also measure the car's velocity as 50 km/h.