Question

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

Answer 1

"(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 2

Answer:block at constant velocity

Explanation:Constant velocity is a condition for objects at equilibrium