Question: A cement block accidentally falls from rest from the ledge of a 70.0 -m-high building. When the block is 16.6 m above the ground, a man, 1.70 m tall, looks up and notices that the block is directly above him.
Part A: How much time, at most, does the man have to get out of the way?
Explain how you came up the prefixes and answer please.