From the Roof of a Building 100 Feet Above the Ground

Multiple Choice

From the roof of a building 100 feet above the ground, you toss a coin upward with an initial velocity of 6 feet per second. The height h (in feet) of the coin at time t (in seconds) after it is tossed is modeled by $h = - 16 t ^ { 2 } + 6 t + 100$ . Find the time when the coin is again 100 feet above the ground.

A) $\frac { 3 } { 8 }$ second
B) 0 second
C) $\frac { 3 } { 16 }$ second
D) $\frac { 3 } { 4 }$ second
E) $\frac { 8 } { 3 }$ seconds