Drop the ball on the floor and observe its motion. identify all the energy forms associated with the ball at these times:

about to be dropped
falling down
hitting the floor
moving back up

about to be droppedgravitational potential energy

falling downKinetic energy

hitting the floorpotential energy

moving back upKinetic energy

Explanation:

When the ball is about to be dropped it possesses potential energy.This is the energy stored in an object.When the ball is released, the potential energy will be converted to kinetic energy.Kinetic energy is the energy an object has due to its motion.When the ball hits the floor, energy is lost in form of siund and heat.The kinetic energy when falling will be transformed to potential energy which is lesser than the initial one when the ball was about to be dropped.The ball bounces back after hitting the floor.The potential energy is converted back to kinetic energy .

the total distance that martina travels that day is

(distance from home to mom's office) plus (distance from mom's office to school)

plus (distance from school to library) plus (distance from library to friend's house)

plus (distance from friend's house to martina's house).

(we don't know what any of these distance actually is.)

3. dark matter

empty space could also be a simple vacuum