A system initially consists of a ball of mass m at rest at height h above the Earth and the Earth, of mass Me. When the ball has fallen a distance h/2, the total momentum of the system is:

Give an example to prove that your society is developed more than it was before 10 years ?

The primary purpose of a certificate of confidentiality is to: allow law enforcement to investigate abuse cases.protect researchers from disclosing conflicts of interest.prevent subjects from knowing the purpose of a study.protect identifiable research information from compelled disclosure.

What period of history refers to the time when people did not have written records