# Mini-Quiz: Derivation of Displacement-Time Gravity Equations

by Ron Kurtus (revised 7 January 2011)

Take this Mini-Quiz to check your understanding of the lesson material.

1. What is the starting point for deriving the gravity equation for displacement in a given time?

Start by measuring the displacement

You must decide whether to throw the object up or down

2. Why must you do two integrations to find y?

Distance always requires doing integration two times

You integration both the left and right sides of the equal sign

3. How is the equation gt2 + 2vit − 2y = 0 solved for t?

By using the formula for solving quadratic equations

By trial and error

You first solve for g and then substitute in values for t

If you got all three correct, you are on your way to becoming a Champion in Physics. If you had problems, you had better look over the material again.

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