Answer:
Friction is a force that opposes motion.
Answer:
4 m/s
Explanation:
KE =
Velocity of balloon will be 4 m/s.
!! Hope It Helps !!
OK.
But first we need to know . . .
-- Where is Riverdale ?
-- What is the air temperature there right now ?
-- What kind of system is being used now ?
-- Where can we get a complete description of the groundwater system ?
Answer:

Explanation:
We know that heat relates to mass, specific heat and variation of temperature experimented because of this heat through the equation
. The heat released by the unknown material is absorbed by water, so we have
, and we can write:

Since thermal equilibrium is reached we know that
, where we have added
to convert the temperature from Celsius to Kelvin, as <em>we must do</em>. Since we want the specific heat of the unknown material, we do:

Which for our values is:
