28. A student notices that when a weight is hung on a spring, the spring stretches. She decides to conduct an experiment to determine the relationship between the amount of weight placed on a spring and the distance the spring stretches. She has five different weights: 25 9,50 9, 75 9, 100 g, and 125 g. She selects a weight, hangs it on the spring, and
measures how far the spring stretches
What is the independent variable in this experiment?
length of unstretched spring
O distance the spring stretches
weight hung from the spring
O temperature of the spring

weight hung from the spring

Explanation:

An "independent variable" refers to the variable that is being changed or manipulated in an experiment. This is being done in order to check its impact on the "dependent variables." The independent variable does not rely on any other variables.

In the experiment above, the independent variable is the "weight." This variable is being manipulated in order to know how far the spring will stretch. This is the reason why there are five different weights, which means there will be five different distances expected to be covered by the spring.

b) 10 minutes

girls stopped for 10 minutes.