I believe the answer is H for when you bounce it, it has stress when it hits the floor and then goes up giving it kinetic
Answer:

Explanation:
When an object strikes the ground, the potential energy of the rock gets converted to the kinetic energy.
A rock is dropped from a distance
above the surface of the earth and is observed to have kinetic energy
when it hits the ground.
For another rock, It is dropped from twice the height
above the earth’s surface and has kinetic energy
when it hits.
For the first rock,
..............(1)
For the second rock,
..............(2)
Dividing equation (2) by (1) we get :

Hence, this is the required solution.
Answer:
12.5 m/s North/east
Explanation:
I thought of it as a graph. I basically just found the distance between the points (0,0) and (10, 7.5)!