The mass of the first object in a collision.
The mass of the second object in the collision.
The mass of two objects combined.
How fast the first object is going before the collision.
The initial velocity of the first object.
How fast the second object is going before.
The speed of the second object before the collision.
The final velocity of the first object.
The velocity of the second object after the collision.
The velocity after an perfectly inelastic collision of two objects.
The mass used on the after side in a perfectly inelastic collision of two objects.
The velocity before when an object splits apart.
The velocity before for a moving object that explodes.
The mass of an object before it explodes.