At what time, does the speed become constant?

Explanation: For an object to achieve constant speed in a specific period of time, it has to have constant current speed and to be moving in the same direction, meaning that the object has to move in one direction without taking turns so that the speed doesn't decrease or increase. Constant speed is measured when an object travels equal distance for equal amount of time.

- "the choice that is not an indicator of a chemical change is "state of matter changes". more common than not, chemical reactions produce energy in the form of light or heat. along with energy, they also produce a new substance called the product that could be in any state of matter (solid, gas, or liquid)."