! A catapult is used to launch a boulder. The height of the boulder, h, can be modeled by the

! A catapult is used to launch a boulder. The height of the boulder, h, can be modeled by the function h(t) -16t^2 + 64!. where r is the time in seconds after the boulder is launched. Assuming that the boulder doesn’t hit anything, how many seconds after launch will the boulder hit the ground?

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