A2 kg ball of putty moving to the right at 3 m/s has a perfectly inelastic, head-on

  to the right

Explanation:

The balls collide in a completely inelastic collision, in other words they have the same velocity after the collision, this velocity has a magnitude V.

We need to use the conservation of momentum Law, the total momentum is the same before and after the collision.

In the axis X:

    (1)

To test this hypothesis, you changed the TEMPERATURE of the gas between 0 and 100°C

(273 and 373 K) and calculated the resulting VOLUME of the gas.

 Therefore the independent variable was TEMPERATURE and the dependent variable was VOLUME