You spin an 800-gram mass on a thin string of length 0.5 m around your head. If the tension in the string is greater than 12 N, the string will break. You start to string the mass around your head faster and faster: a) At what angle from the vertical will the string break?
b) At what velocity will the string break?

c the car's velocity increases constantly over time.

okay i have so many questions. but the big one here is: um wt..f is this mess? ?

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.