Kinematics help

1. The problem statement, all variables and given/known data
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

2. Relevant equations

Not sure.

3. 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.

http://ift.tt/1g1WnCb

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