One end of a 50 kg mass is attached to two vertical springs in parallel. each spring has a spring constant of 20 n/m. when the spring is pulled back and released, what is the spring’speriod?
a. 14.049 s
b. 7.02 s
c. 14 s
d. 7.0 s
e. 0.14 s

no

sodium is solid at rt

a.   mass number from atomic number

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.