Descriptive investigations are mainly questions to uncover information. it does not have an hypothesis. It is mainly gathering information, it is not repeatable as you are just asking questions
Descriptive investigations are not repeatable because they are based only on observations made at a single point in time. The results may vary at a different time. In addition, descriptive investigations do not contain variables that may indicate cause-and-effect relationships.
ad then 
, where 
is the sea level weight, 
the sea level accel., 
the accel. above while 
the weight above.