The observation deck of tall skyscraper 311 m above the street. determine the time required for a penny to free fall from the deck to the street below. (make x negative since the penny is falling)

8.0 s

Explanation:

The penny is in free fall, so its motion is a uniform accelerated motion with constant acceleration; therefore we can use the following suvat equation:

where

s is the displacement

u = 0 is the initial velocity of the penny

t is the time

is the acceleration of gravity

The displacement is

s = -311 m

So we can re-arrange the equation to solve for t, the time of flight:

the area between the graph and the t axis

im sorry i dont know