what does question 3 want? it is for an Atwood machine lab

1 . Were all the "velocity versus time" graphs linear? 2. Was the "a versus fractional mass" graph linear as predicted? How did your value for the slope of the graph compare with the accepted value for the "gravitational force per unit mass"? 3. Did your "a versus fractional mass" graph go through the origin? Can you suggest reasons why it might not pass exactly through the origin? 10