Answer:
45.9m
Explanation:
Given parameters:
Final velocity  = 30m/s
Initial velocity  = 0m/s
Unknown:
Time it takes for the object of fall  = ?
Height of fall = ?
Solution:
For the first problem, we use the equation below to solve for t;
   V = U + gt
V is the final velocity
U is the initial velocity
g is the acceleration due to gravity
t is the time taken
     30  = 0 + 9.8 x t
     30  = 9.8t
      t  = [tex]\frac{30}{9.8}[/tex]  = 3.1s
Now, height of fall;
 V² = U²  + 2gH
  30² = 0² + 2 x 9.8 x H
  900  = 19.6H
   H  = 45.9m
