While repairing a defective radio transmitter located 410 m up on the Skydeck

Question

of Chicago’s Sears Tower, Lyle drops his hammer that falls all the way to the
ground below. a) How long will it take for Lyle’s hammer to fall? b) With what
speed will the hammer hit the pavement? c) How far will the hammer have
fallen after 1.50 s when a janitor watches it pass outside an office window?