Balanced or unbalanced?
a car is traveling at 20 m/s and the driver steps on the brake.
a bicyclist pedals to maintain a constant speed of 3.5 m/s
a chair is dragged across a floor at a constant velocity.
a plane makes a turn at a constant speed
an object is dropped vertically and falls toward the ground.

Unbalanced because if it is pushing then stopping, that means that it is unbalanced.

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.