How does work get affected when a object is lifted up instead of using a ramp

Matt is driving down 7th street. he drives 150 meters in 18 sec. assuming he doesn’t slow down or speed up, what is his speed?

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?

The first law of thermodynamics states that heat added to a system is neither created nor destroyed but is as it changes into other forms of energy.