Question: A rock is projected directly upward from ground level with an initial velocity of 90 ft per sec. (a) Give the function that describes the

A rock is projected directly upward from ground level with an initial velocity of 90 ft per sec.

(a) Give the function that describes the height of the rock in terms of time t.

(b) Determine the time at which the rock reaches its maximum height and the maximum height in feet.

(c) For what time interval will the rock be more than 120 ft above ground level?

(d) After how many seconds will it hit the ground?

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