Explain gold leaf electroscope

Need in all of themmm only answer if you know plsssss

Two carts, one of mass 2m and one of mass m, approach each other with the same speed, v. when the carts collide, they hook together. assume that positive momentum is to the right. which graph best represents the momentum of both carts over time, before and after the collision?

Sort the images based on whether there's a force of attraction or repulsion between the magnets shown. attraction repulsion