Two billiard balls with identical masses and moving in opposite directions have a 100 % elastic (perfect bounce)
head-on collision. Before the collision, each ball has a
speed of 21.9 cm/s. Find the speed of each billiard ball
immediately after the collision.
(hint: total mo = o before they collide)

im not to sure what it is

the simple machine has three main features. they are:

fulcrum is the center point or pivot point of the machine. effort is input force/ applied force. load is external force/ output.

the keisha 's machine labels are

x : load

y: fulcrum

z: lever

in this image, you can see solar radiation going through ocean water.

no image, but probably absorption

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.