Is there a net force acting on the planet earth? explain.

Yes

Explanation:

So there is a net force acting upon Earth. The net force is zero. The same force you apply is the same force that is pushing back to you. Nobody wins not you or gravity. Nobody wins because if you win you will be floating because there will be no gravity pulling you down. If gravity wins you will end up being crushed into the ground.

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.