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## Homework Statement

A pen falls from the top of a roof. We know that it takes 1.5 seconds to fall the last 1/4 distance. Find the height of the roof from the ground.

## Homework Equations

x=x_0 + v_0 * t + 1/2 gt^2

v=v_0 + gt

## The Attempt at a Solution

Since the problem does not say that the pen falls from rest, I don't know what v_0 should be. Also, how can I make use of the time that it travels the last 1/4 distance.

Any help please.