A large explosion causes wood and metal debris to rise vertically into the air with an initial velocity of 144 feet per second. The polynomial h(t)=144t-16t2 gives the height of the falling debris above the ground, in feet, t seconds after the explosion. a.  How high, in feet, will the debris be 4 seconds after the explosion? B.  How many seconds will it take for the debris to land back on the ground?

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