(100 POINTS)all questions pleasee

3).

Explanation:

If you mean that the sum of 2 vectors is equal to either vectors in term of magnitude and direction then no, unless both vectors are zero vectors. However the direction of the sum of 2 vectors can be the same as the direction of either vectors provided that both vectors are parallel.

it is called kinetic energy

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.