A 2.9-kg firework is fired from the ground straight up on a planet with whose acceleration due to gravity is 3.3 m/s/s. You want the firework to explode when it is at a height of 106 m. You want the firework to be moving down at a speed of 13.7 m/s when it explodes. Use this information to find out how fast you should launch your firework and how much time you should have on your trigger.

a electromagnetic waves

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.

friction

explanation:

they us to move forward and backwards