A200 g hockey puck is launched up a metal ramp that is inclined at a 30° angle. the coefficients of static and kinetic friction between the hockey puck and the metal ramp are μs = 0.40 and μk = 0.30, respectively. the puck's initial speed is 93 m/s. what vertical height does the puck reach above its starting point?

the vertical height reached by the puck is 580.47 m

Explanation:

given,

mass of hockey puck = 200 g

angle of inclination (θ )= 30°

μs = 0.40                                      

μk = 0.30                                

initial velocity = 93 m/s

acceleration of pluck upwards,

a = - g (cosθ ×  μk +sin θ)                              

a = - 9.81 × (0.3 × cos 30°  +sin 30°)

a = -7.45 m/s²

now,                                    

s =

s =

s = 580.47 m

the vertical height reached by the puck is 580.47 m

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.