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Wavelength,frequency,and energy are related.what happens to a wave as it’s wavelength gets shorter?

The diagram shows four locations in the electric field of a positive point charge m. at which location is the electric potential the greatest.

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?