It is an example of rolling friction because balls roll.
Answer is ROLLING
The correct answer is 40.5 Newtons just finished the quiz and 36.5 was incorrect.
Answer:
In a controlled experiment, an independent variable (the cause) is systematically manipulated and the dependent variable (the effect) is measured; any extraneous variables are controlled. The researcher can operationalize (i.e. define) the variables being studied so they can be objectivity measured.
A) the final velocity = 66/9 m/s.
b) The total momentum before and after collision is the same because energy is destroyed or made.
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