Question

An object that is projected straight downward
with initial velocity v feet per second travels a
distance s vt 16t
2
=+ , where t =time in seconds.
If Ramón is standing on a balcony 84 feet above
the ground and throws a penny straight down
with an initial velocity of 10 feet per second, in
how many seconds will it reach the ground?

Answer 1

2. h = Vo*t + 0.5g*t^2 = 84 Ft.
10t + 16t^2 = 84
16t^2 + 10t - 84 = 0
Use Quadratic Formula.
t = 2 s.

Answer 2

Henry is right