A book is placed on a table and a rock sits on top of a cliff. Which statement is correct?
Both the book and the rock have kinetic energy.
Both the book and the rock have potential energy.
O The book has potential energy and the rock has kinetic energy.
The book has kinetic energy and the rock has potential energy.

What was piaget's explanation as to why preschool-age children in the preoperational stage make errors on tasks requiring conservation? a) preschool children's tendency toward centration prevents them from focusing on other relevant features of a situation b) preschool children have not yet developed numerical understanding; therefore, different amounts are meaningless c) preschool children's neural-visual network is not fully matured d) preschool children have not lived long enough and accrued enough experience to know the difference between quantities