Bethany solves a physics problem by developing and testing several hypotheses. according to piaget, this is an example of the stage of cognitive development.

According to Piaget, the example of this stage of what Bethany acquies in the cognitive development is known as the formal operational. In the formal operational stage, the person tends to use his or her skill in logical thinking or planning which could be seen above where she tries to test hypothesis in which she uses her logical thinking.

industry had made the u.s. the richest nation in the world at this time. the second industrial revolution caused growth in industry and transportation, which allowed increased trade between nations. click to let others know, how is it

a is your answer hope this ! : )