A ball is thrown vertically into the air. Energy is transferred from a chemical store.
Where is the useful energy transferred to?

A A gravitational store and a thermal store only.
B A gravitational store only.
C A gravitational store and a chemical store only.
D A thermal store and a chemical store only.

if the forces acting on an object are unbalanced, the object will accelerate in the direction of the net force on the object.

explanation:

this is best explained by having an understanding of newton's second law, which states that f=ma. you see, when the forces are unbalanced, net force (sum of all forces) is not zero. therefore making it necessary for the object to have an acceleration in the direction of the net force.

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

hope this ! : )