Quadradic Equation Word Problems - Examples & Practice

An object is launched at $19.6$ meters per second (m/s) from a $58.8$-meter tall platform. The equation for the object's height $s$ at time $t$ seconds after launch is $s(t) = \ –4.9t^2 + 19.6t + 58.8$, where $s$ is in meters. When does the object (in seconds) strike the ground?