Kinematics help - object is dropped from a height h

[GoGoGadget]

Kinematics help -- object is dropped from a height h

Homework Statement

An object is dropped from a height h and strikes the ground with a velocity v. If the object is dropped from a height of 2h, which of the following represents its velocity when it strikes the ground?

A) v

B) 1.4v

C) 2v

D)4v

Homework Equations

Not sure.

The Attempt at a Solution

I thought that velocity in this situation would be represented as 2v, but the answer in my book says the correct answer is B. I wasn't quite sure how to figure that out or what the relevant equation for figuring this problem out might be.

 

[jackarms]

Try this equation:
$$v^{2} = v_{0}^{2} - 2g\Delta y$$