A missile is fired vertically into the air the distance t

Question

Question: Solve the given problems. All numbers are accurate to at least two significant digits.

A missile is fired vertically into the air. The distance t (in ft) above the ground as a function of time (in s) is given by s = 300 + 500t - 16t².

(a) When will the missile hit the ground?

(b) When will the missile be 1000 ft above the ground?