The KEOM tower across the street from West is approx. 155 meters high (about 510 feet). On a dare, your friend climbs to the top and drops a physics book to see what will happen. You bet them you can figure out how long it will take to fall to the ground. What time do you confidently tell your insane friend? (Remember, down is always a negative direction. Round answer to tenths place or 2 sig figs. Enter a decimal if needed. Enter the number only, no units)