The diagram below shows the position of the sun and two galaxies, G1 and G2
distance between the sun and galaxy G1 is represented by Y.
What is the value of Y in km?
1) 100 billion km
O2) 100 million km
O3) 500 billion km
O4) 500 million km

  concave means having an outline or surface that curves inward like the interior of a circle or sphere. so the mirror curves inward.

Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction 

35.98  million  mile my friend

The object's initial distance above the groundthe object's initial velocity