A large explosion causes wood and metal debris to rise vertically into the air with an initial velocity of 80 feet per second. The function h(t) = 80t - 16t2
gives the height of the falling debris above the ground, in feet, t seconds after the explosion.
A) Use the given function to find the height of the debris 4 seconds after the explosion:
After 4 seconds, the height is
feet.
B) How many seconds after the explosion will the debris hit the ground?

seconds.
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