A person riding a merry-go-round passes very close to a person standing on the ground once (event $A$ ) and then again (event $B$ ). Assume the ground is an inertial frame and that the rider moves at a constant speed.
-(a) Which person's watch measures a proper time $\Delta t$ between events $A$ and $B$ ?
A) The rider in the merry-go-round
B) The person standing on the ground
C) Both
D) Neither

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The Answer of A person riding a merry-go-round passes very close to a person standing on the ground once (event $A$ ) and then again (event $B$ ). Assume the ground is an inertial frame and that the rider moves at a constant speed.
-(a) Which person's watch measures a proper time $\Delta t$ between events $A$ and $B$ ?
A) The rider in the merry-go-round
B) The person standing on the ground
C) Both
D) Neither

A Person Riding a Merry-Go-Round Passes Very Close to a Person