Pls help me i really really need help can anyone help i will name brainliest

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?

Explain what it means to view something from a frame of reference. provide an example that illustrates your explanation. (4 points)

Which planet do you think would be easiest for humans to colonize some day?