It is possible for John to catch the key.
Explanation:
Given:
height, h = 6m
h = -11t² + 20t + 1
Substituting h = 6m in the equation
6 = -11t² + 20t + 1
11t² - 20t + 5 = 0
On solving the above quadratic equation we get
t = 1.5 seconds approximately.
Thus, we can say that John will be able to catch the key because the key reaches to him in 1.5 seconds.
