How can you tell if an object has elastic properties?
a.)if two people pulls on it in opposite directions it falls apart
b)if two people pull on it ,it maintains its original size and shape
c)if two people pull on it in opposite directions ,it stretches and remains in a new shape
d.)if two people pull on it in opposite direction, it stretches. then when they let it go, it turns to its original size and shape

13.2 elasticity elasticity is a fundamental property of materials. springs of all kinds are examples of elastic bodies. let us consider the characteristics of a spring. we find that a spring will respond to distorting force and then return to its original shape after the distorting force is removed. any material or body can be deformed by an applied force. if it returns to its original shape after the force is removed, it is said to be elastic. most substances are elastic to some degree. in a technical sense a substance with a high elasticity is one that requires a large force to produce a distortion-for example, a steel sphere!

The independent variable is the type of music.the dependent variable is the pulse rate.the intervening variable is the age of the subject.if the mother does not like rock, her pulse is likely to not increase.the same might be true for the sister.the friend may like rap and gets excited.to establish cause/effect relationship, all of the subjects must be consistent.hope i .