Paintball guns were originally developed to mark trees for logging. A forester aims his gun directly at a knothole in a tree that is 8.0 m above the gun. The base of the tree is 18 m away. The speed of the paintball as it leaves the gun is 50 m/s.

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.

b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle

continuous conducting path for current, power supply

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.