Question

Ex. 1 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) = –4.9t2 + 19.6t + 58.8, where s is in meters.

A  What is the height above the ground when the object is launched?

B  How long before the object hits the ground after launch?

C  What is the maximum height of the object?

D  When does the object reach its maximum height?