I've read up on time dilation and how gravitational/kinematic time dilation work but I have not received a clear answer on how the two work together.
If you are observing something traveling at a speed that causes one second to dilate to .5 seconds, and it is in a position within a gravitational field that causes one second to tick by at .75 seconds for a non-moving object. Then what is the total time dilation effect being observed?
I've heard it is not additive but a product of the two, does that mean the effect would be:
Time ticking by .375 seconds for every 1 second from the observers point of view?