A hockey puck of mass m is moving in the +x-direction at speed vP1 on a frictionless, horizontal surface. It collides with a stone of mass 2m that is initially at rest. After the collision the hockey puck is moving at an angle θ measured from the +x-direction toward the +y-direction and the stone is moving at the same angle θ but measured from the +x-direction toward the −y-direction. In order for the y-component of momentum to be conserved, what must be the ratio of the final speed vS2 of the stone to the final speed vP2 of the hockey puck?

the electric field is a “force field” around a charged object that illustrates the direction the electric force would push an imaginary 

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.