7 V 0.5kg
in Practice
1. A mass spring system is in SHM in the horizontal direction. If the mass is 0.25
kg, spring constant is 12N/m, and the amplitude is 15 cm,
a) what is the maximum speed of the mass?
Ans: 1.01 M/S
b) What is the speed at a half-amplitude position? Ans: 0.12 M/S
2. The mass m is now stretched a distance of 8 cm and held. What is the potential ener-
gy? (k = 196 N/m)
Ans: 0.6272)

Sorry cant find the answer but i hope you got it right and if you didn't you'll still do great. :)

Explanation:

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.