Question

the observation desk of a tower is 338 meters above the street. determine the time required for a penny to free fall from the deck to the street below?

Answer 1

\[\large x_f=x_i+v_i t+\frac 1 2 at^2\]
you start 338 meters above the ground
your final position is the ground
you are free-falling

since you are free-falling
\[\large a=g=9.8m/s^2\]