Jordan drops a penny off the empire state building. neglecting air resistance, how fast is the penny traveling after 6 seconds? how far has the penny fallen after 6 seconds?

The acceleration of gravity is 9.8 m/s².  That means that when something
is falling here on Earth, its speed increases by 9.8 m/s every second that
it falls.  In other words, whenever you look at it, it's falling 9.8 m/s faster
than it was falling one second earlier. 

If you drop an object from some high place ... high enough that it can
keep falling for 6 seconds and not hit the ground yet ... it falls 9.8 m/s
faster every second, and at the end of 6 seconds, it's falling at

           (6) x (9/8 m/s)  =  58.8 meters per second.

At the beginning of the 6 seconds, its speed was zero.
At the end of the 6 seconds, its speed is  58.8 meters per second.
Its AVERAGE speed over the period of 6 seconds is

                 (1/2) (0 + 58.8 m/s)

             =     29.4 meters per second .

Distance = (average speed) x (time)

              =   (29.4 m/s)  x  (6 sec)

              =       176.4 meters  .

BTW ... Jordan may be in trouble.  I'm pretty sure it's illegal
in New York City to drop anything off of a tall building.
If someone happens to be walking by the building at that
particular moment, or 6 seconds later, getting hit in the head
by a penny falling at  58.8 m/s (about 132 mph !) can really
smart, and can muss your do for the rest of the day.

Because its reliable.   there is no pollution  the chances of a radiation leak is low