What occurs when the frequency of a forced vibration is the same as the object's natural frequency ?

Resonance occurs

Explanation: A phenomenon that occurs when the frequency of a vibration forced on an object matches the object's natural frequency and a dramatic increase in amplitude occurs.

v 154.9= 0.9 length length s little over 154.9cm

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.