State two applications of plane mirrors

Alexander calder's mobiles are an example of motion because it uses forces of wind and water.

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?

There is no gravity in outer space . explain why this statement is true or false