What components make up fire

Standing side by side ,you and a friend step off a bridge at different times and fall for 1.6s to the water below.your friend goes first,and you follow after he has dropped a distance of 2.0m.when your friend hits the water,is the seperation between the two of you 2.0m or more than 2.0m? verify your answer with a calculation.

If forces acting on an object are unbalanced. true or false

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?