Afootball is kicked straight up from a height of 5 feet with an initial speed of 55 feet per second. the formula h equals negative 16 t squared plus 55 t plus 5 describes the ball's height above the ground, h, in feet, t seconds after it was kicked. how long will it take for the football to hit the ground?

3.53 second

Explanation:

The formula for the height is

When it hits the ground, the height is zero.

So, put h = 0 in the above equation

Take positive sign

t = 3.53 second.

Thus, the time taken to hit the ground is 3.53 second.

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.