The stone's altitude at time 
is given by
where 
is the acceleration due to gravity. The stone reaches the ground when 
:
Answer: 75 ft
Explanation:
Breaking distance = Speed²/ 20
= 30²/20
= 45 feet
Stopping distance = Speed + braking distance
= 30 + 45
= 75 ft
Number three
They contain protons (positive), neutrons (negative), electrons (neutral) and all are in a nucleus which is part of an atom
Electric energy<span> is the </span>energy<span> created by electrons moving through an </span>electrical<span> conductor. </span><span>When electrons are forced down a conductive path, such as a wire, the movement produces electricity, or </span>electric energy<span>. Plz mark as best answer.</span>
