If a Projectile Is Launched Upward from the Ground with an Initial

Multiple Choice

If a projectile is launched upward from the ground with an initial velocity of 64.5 feet per second, its height $h$ in feet $t$ seconds later is given by the function $h(t) =-16 t^{2}+64.5 t$ . After how many seconds does the projectile land on the ground?

A) 4.0 seconds
B) 2.0 seconds
C) 8.1 seconds
D) 0.2 seconds