In your demo video about free body diagram, you have explained that smaller mass displaced 2x and acceleration is 2a. how?

I was thinking that if big mass moves x distance, the smaller mass moves x/2 distance over the pulley.

I am trying to buy the physics package for my daughter, but after seeing the demo, I would like to get clarified.

Thank you for your time

Three identical balls are placed on a frictionless horizontal surface touching each other. They stick to each other because of adhesive. Another ball of same radius and mass m is placed over the void created by the three balls. Find the forces applied by the balls kept on the floor to each other if the system remains in equilibrium.

A car loaded with water having total mass 1000 kg moves on a straight horizontal Road starting from rest under the action of a force of 100 Newton. The water spills throw a small hole in the bottom at a rate of 0.1 KG per second the velocity of cart after 300 seconds is nearly.

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