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.
Let's say that the rock(s) and the blade have a perfectly elastic collision. With the large rock, after the collision its velocity will be 10kg/(5.5kg)100 m/s ~ 181 m/s. The small rock, after the collision, will have velocity 10kg/(5.003)100 m/s ~ 200 m/s. (This is a pretty small muzzle velocity for a bullet). Since its mass is much smaller, however, this means it has far less kinetic energy than the large rock, and a much smaller momentum.