On Jun 10, 1:01 am, Poutnik wrote:
Koobee Wublee wrote:
On Jun 2, 11:08 am, Amid wrote:

Does relativistic speed really increases the mass of a body?

You can reformulate the question as
"Is observed body mass real body mass ?"

Which is a moot point really. shrug

The best interpretation to this is to treat mass as a observed
quantity mirroring that energy is an observed quantity as well.
shrug

Interestingly experimental results seem to indicate that the
gravitating mass is the rest mass of the gravitating body. shrug

Rather
Gravitational mass
= Inertial mass
= total body mass
= rest / invariant body mass for body in the rest.

Gravitational mass drops out in the geodesic equations. However,
Koobee Wublee was talking about gravitating mass not gravitational
mass. Does Poutnik understand what Koobee Wublee means by gravitating
mass? shrug

It is most likely that mass does not have anything to do with
gravitation in which (G M) is merely a grossly simplified model
describing gravitation. shrug