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It will have increase in speed with increase in time
The speed of the object will increase.
According to the speed of the aircraft on which the object is loaded
The speed of the object will increase.
Then you are determining the object's average acceleration (provided the initial and final speed are in the same direction).
Yes. Planets (and other things) orbit at a higher speed the closer they are to the object they are orbiting.
they get faster
It will have increase in speed with increase in time
It will have increase in speed with increase in time
It will have increase in speed with increase in time
The speed of the object will increase.
if the angular speed of an object increase its angular momentum will also increase
What's relevant is the black hole's mass in this case. That's the same as if you change the mass of any other object around which another object orbits - for example, the mass of a star. For a higher mass of the central object, the orbiting object must move faster - assuming it is at the same distance of course.
It doesn't - the object will never achieve the speed of light, since an infinite mass is not possible (it would require infinite energy). This only describes a tendency: as the object gets closer and closer to the speed of light, so, too, will its mass increase more and more, approaching infinity - this means there is no upper limit to the mass as the object approaches the speed of light.
According to the speed of the aircraft on which the object is loaded
The speed of the object will increase.
Then you are determining the object's average acceleration (provided the initial and final speed are in the same direction).