Performing the Chemical Test by Reagent Strip The urine must be collected using appropriate technique and be tested within one hour ofcollection. If tests cannot be performed within this time, the specimen may be refrigerated for upto 8 hours.
Elastic and Inelastic Collisions. A perfectly elastic collision is defined as one in which there is no loss of kinetic energy in the collision. An inelastic collision is one in which part of the kinetic energy is changed to some other form of energy in the collision. Any macroscopic collision between objects will convert some of the kinetic energy into internal energy and other forms of energy, so no large scale impacts are perfectly elastic.
As it hits the floor, it bounces back up into the air with the same momentum as before. Perfectly elastic collisions are a bit ideal. In most cases, some heat is generated when the billiard balls collide or the dropped ball hits the floor. But since the objects retain their shape after the collision, we can use this term to describe this type of collision in the real world.