An object is thrown upward from the top of a 144-foot building with an initial velocity of 128 feet per second. the height h of the object after t seconds is given by the quadratic equation h equals negative 16 t squared plus 128 t plus 144. when will the object hit the ground?

After 9 seconds the object reaches ground.

Step-by-step explanation:

We equation of motion given as h = -16t²+128t+144,

We need to find in how many seconds will the object hit the ground,

That is we need to find time when h = 0

                        0 = -16t²+128t+144

                       16t²-128t-144= 0

Negative time is not possible, hence after 9 seconds the object reaches ground.

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