what is the kinetic energy that the device contains immediately before it hits the ground? [ke = /2*m*v-]

Kinetic energy : "It is the energy possessed by body by virtue of its motion" .

Explanation:

The mechanical energy is the energy that a body has due to its motion or position .

It is of two types :

Potential energy

"It is the energy that a body has due to its position or state" .

It is given by P.E=mgh

Kinetic energy

"It is the energy that a body has due to its motion" .

The formula is : K.E=1/2mv².

For example

the reason is because the moon has some form of gravity, and that gravity pulls the ocean tides.