In an experiment students placed a dialysis bag containing 100 ml of a starch water

This question is incomplete. The rest of the question is listed below:

To measure the volume of the starch-water mixture in the dialysis bag, the students should have used a (1) meterstick (3) graduated cylinder (2) triple-beam balance (4) test tube

The answer is 3) graduated cylinder. A measuring stick to measure depth would not have worked as the overall volume of the beaker containing the dialysis bag would not have changed. A test tube would generally have insufficient volume to measure the volume of the dialysis bag and a test tube is generally not graduated. A triple beam balance is generally used to weigh mass and not volume.  

Explanation:

It is known that kinetic energy is the energy obtained by an object due to its motion.

Mathematically,          K.E =

where,         m = mass of the object

                    v = velocity

Whereas gravity is the force which tends to attract an object towards its center.Energy obtained by an object due to its position is known as potential energy.

Mathematically,         P.E = mgh

where,    m = mass of the object

                g = acceleration due to gravity

                h = height of the object

Thus, we can conclude that factors which are used to calculate the kinetic energy of an object are velocity and mass.