Two Cannonballs Are Dropped from a Second Floor Physics Lab

question 21

Multiple Choice

Two cannonballs are dropped from a second floor physics lab at height h above the ground. Ball B has four times the mass of ball A. When the balls pass the bottom of a first floor window at height above the ground, the relation between their kinetic energies, K_A and K_B, is

• A) K_A = 4K_B.
• B) K_A = 2K_B.
• C) K_A = K_B.
• D) K_B = 2K_A.
• E) K_B = 4K_A.

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Definitions:

Independent Variables

Variables in an experiment or study that are manipulated or changed to determine their effects on dependent variables.

Observations

The act of measuring or recording data points or occurrences in a scientific or systematic manner for analysis.

Independent Variable

An independent variable is a variable that is manipulated in an experiment to see if it causes a change in another variable.

Multiple Regression Model

A statistical method that explains the relationship between one dependent variable and two or more independent variables.