Answer:
wind speed i think where i live?
The stone's altitude at time
is given by

where
is the acceleration due to gravity. The stone reaches the ground when
:

Answer:
Europium has a bright shiny surface. it's steel grey and has a melting point of 826 degree Celsius and a boiling point of about 1,489 degree Celsius.
Explanation:
the density is 5.24 grams per cubic centimeter.