A Ball Is Projected Upward from Ground Level $t$ Seconds, Its Height in Feet Is a Function Defined By Seconds

Multiple Choice

A ball is projected upward from ground level. After $t$ seconds, its height in feet is a function defined by $f(t) =-16 t^{2}+64 t$ . After how many seconds will it reach a height of $48 \mathrm{ft}$ ?

A) $1.5 \mathrm{sec}$ and $3.5 \mathrm{sec}$
B) $1 \mathrm{sec}$ and $3 \mathrm{sec}$
C) The ball never reaches a height of 48 feet.
D) $1 \mathrm{sec}$