Any help will be appreciated

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What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration

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?