Pulley multiple choice question

Question

Two masses m1 and m2 are attached to opposite ends of a cord placed around a pulley as shown. There is no friction between the pulley and it's axle, but there is friction between the string and the pulley. m2 has a greater mass than m1, both masses are held stationary at the same horizontal level as shown and then released. Which of the following graphs best describes the speed v of the fixed point P on the pulley as a function of time t?

Here are the choices of graphs: https://docs.google.com/document/d/1sP60u38WmxO3iabA7uhY2kgZUg8m98ygWAzKyHnpIPo/edit?usp=sharing

Answer 1

I do not see any picture of the pulley, so I am just using my imagination.

This is what will happen in reality.

The larger weight will start falling down, pulling the smaller weight up,

and turning the pulley.

The speed of a point on the pully will be proportional to the speed of the weights.

1) Everything will be driven by gravitational acceleration, meaning that

everybody's speed will be increasing linearly.

2) Then air friction will start playing an increasing role,

causing the speed increase to be sub-linear.

3) The weight m1 will crash into the pulley, causing everything to stop.

The answer to the question is:

C in case all three of the above effects are taken into consideration.

D in case only effects 1) and 2) are taken into consideration.

B in case only effect 1) is taken into consideration.