A rock is thrown off of a 100 meter cliff with an upward velocity of 30 m/s. As a result its height after t seconds is given by the formula: h(t) = 100 + 30t - 5t2 What is its height after 7 seconds? What is its velocity after 7 seconds? (Positive velocity means it is on the way up, negative velocity means it is on the way down.) Note: You can earn partial credit on this