1) Should I take vitamin D supplements in the winter?
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Quin's velocity is given by the resultant of the two velocities. If we assume east as positive direction, the two velocitiies are:
is Quin's velocity in his reference frame
is the belt velocity (with a negative sign since it is due west)
Therefore, the resultant is
and the sign tells us the velocity is due east.
Therefore, the resultant is
and the sign tells us the velocity is due east.