No OP these videos are to prove that the acceleration due to gravity is equal on all objects irrespective of their mass, which is true but the total acceleration would be equal in a vacuum
In the case of the video the height isn't enough for you to notice the difference in velocities
You might...
I'm not sure if I understand what you've tried to do
But start by calculating the pseudo force on the block due to the elevators Motion and also the other forces on it. I think you can proceed from there.
You say you've got 3 answers
Unless you state what were your answers, how should we judge...
I don't think there is a term like Darwinian mutation, it's Darwinian Variation, I thinks that's what is throwing you off.
They aren't saying that the mutation is directional.
Since it's in free fall along the plane I think you should take a pseudo force along that line of motion(##mg\sin\theta##)
Extend the length of the pendulum and label ##\alpha## I think you can proceed from there.