stephan is 5 years old, and is able to put moderate-sized jigsaw puzzles together with the of his older brother. if he tries to do the puzzle on his own, he will usually be unsuccessful. according to lev vygotsky, putting together these puzzles falls in stephan’s

zone of proximal development    

Explanation:

Zone of proximal development: The term is given by a psychologist named Lev Vygotsky. The term zone of proximal development (ZPD), is defined as the difference in a person's pattern of learning or doing something on his or her own and that with the help of others.

Example: A student can perform a mathematics calculation with the help of a teacher but can not perform when he or she is alone.

In the question above, according to Lev Vygotsky, putting together these puzzles falls in Stephan’s zone of proximal development.

elastic potential energy