Solve the problem.
-A rock falls from a tower that is 208 ft high. As it is falling, its height is given by the formula $$h = 208 - 16 t ^ { 2 }$$ How many seconds will it take for the rock to hit the ground (h=0)?
A) 13.9 s
B) 2,704 s
C) 14.4 s
D) 3.6 s

Question

Quizplus · Accepted Answer

To find the time it takes for the rock to hit the ground, set h = 0 and solve for t:  0 = 208 - 16t^2  16t^2 = 208  t^2 = 13  t = √13 ≈ 3.6 seconds.

Solve the Problem h=208−16t2h = 208 - 16 t ^ { 2 }h=208−16t2

Solve the Problem $h = 208 - 16 t ^ { 2 }$