A projectile is launched from ground level with an initial velocity of $V_0,$ feet per second. Neglecting air resistance, its hieght in feet $t$ seconds after launch is given by $s=-16t^2+v_0+.$ Find the time $(s)$ that the projectile will reach a hieght of $98ft$ and $($b$)$ return to the ground when $\frac{\frac{?}{?}}{0}=112$ feet per sec

a$)$ Find the time$($s$)$ that the projectile will reach a height of $96ft$ when $v_0=112$ feet er second.

B$)$ the projectile returns to the ground after secon