The uncertainty in the value of the momentum of a trolley passing between two points X and Y varies with the choice of measuring devices.
Measurements for the same trolley made by different instruments were recorded.
distance between X and Y using a metre rule with cm divisions 
distance between X and Y using a metre rule with mm divisions 
timings using a wristwatch measuring to the nearest 
at 
and at 
timings using light gates measuring to the nearest 
at 
and at 
mass of trolley using a balance measuring to the nearest 
mass of trolley using a balance measuring to the nearest 
Which measurements, one for each quantity measured, lead to the least uncertainty in the value of the momentum of the trolley?
1, 3 and 6
1, 4 and 6
2, 3 and 6
2, 4 and 5
