The period of a mass bouncing on a spring is measured in the reference frame of an observer as T. If the system were instead moving past the observer with a velocity of 0.8c, which of the following is closest to the period she would observe?
W) 0.44T
X) 0.6T
Y) 1.7T
Z) 1.9T
✔️Answer:Y) 1.7T
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