Which example best represents balanced forces?

a. an elevator stopped on the third floor
b. a basketball shot into a hoop
c. a sled sliding down a snowy hill
d. a tow truck pulling a car out of a ditch

A.an elevator stopped on the third floor

Explanation:

Newton's second law states that when an object is acted upon unbalanced forces, the object has an acceleration directly proportional to the net force applied to the object:

where

F is the net force

m is the mass of the object

a is the acceleration

From this definition, it is clear that when the forces acting on an object are balanced, the acceleration of the object is zero (because the net force is zero), so the object is either at rest or it is moving at constant speed.

Among the options given, the only object that is at rest or is moving at constant speed is the elevator stopped on the third floor, so this choice is the example representing balanced forces.

its lower due to the doppler effect.: apex