As an object slides across a rough horizontal surface, what happens to the object's gravitational potential energy with respect to the surface and speed? (1) Both gravitational potential energy and speed decrease. (2) Gravitational potential energy decreases and speed remains the same. (3) Gravitational potential energy remains the same and speed decreases.
(4) Both gravitational potential energy and speed remain the same.​

Thomas his older brothers, who own a junk yard, on the weekends to earn extra money. he likes to them push broken-down cars to the back of the junk yard because it makes him feel strong. last saturday, they pushed three cars with different weights, and he noticed he used different amounts of force for each one. the cars were the following weights: white car: 2,700 kg red car: 1,500 kg blue car: 2,100 kg think about how much force is needed to move each car. which correctly lists the cars in order from the most to least amount of force needed to move them? a) white, blue, red b) blue, red, white c) red, white, blue d) white, red, blue

For which pair of objects would adding the same a

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