What is the use of scientific knowledge and research for an action

Me pl give an example of a collision in real life. use the law of conservation of energy to describe the transfer of momentum. be sure and discuss the momentum before and after the collision occurs. you will need at least 3 sentences to thoroughly answer this question.

The smallest particle of an element that retains its identity in a chemical reaction. true or false

The momentum of a car travelinv in a straight line at 20 m/s is 24,500kg·m/s. what is the cars mass?