Which body is in equilibrium?

(1) a satellite moving around Earth in a circular

orbit

(2) a cart rolling down a frictionless incline

(3) an apple falling freely toward the surface of

Earth

(4) a block sliding at constant velocity across a

tabletop

Verified Answer :

"(1) a satellite moving around Earth in a circular orbit" is the only option from the list that describes an object in equilibrium, since velocity and gravity are working together to keep the orbit constant. 

Answer:block at constant velocity

Explanation:Constant velocity is a condition for objects at equilibrium