Con qué velocidad inicial debe lanzarse un objeto directamente hacia arriba para que su altura máxima sea 25 m?

v₀ = 22.1 m / s

Explanation:

This is an exercise in kinetics, let's set a vertical reference system with the positive direction up.

          v² = v₀² - 2 g (y-y₀)

the final velocity at the highest point is zero and as it leaves the floor the initial height is zero

          0 = v₀² - 2gy

         v₀ =

let's calculate

        v₀ =

        v₀ = 22.1 m / s

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.