The ball will hit the ground after 2.355 secs
Velocity of an object
The velocity of an object the change of displacement with respect to time.
Given the function that represents the height of football ground
h(t) = -16t^2+36t+4
The ball will hit the ground at the point where the height h(t) = 0
Substitute
-16t^2+36t+4 = 0
16t^2-36t-4 =0
4t^2-9t-1= 0
Factorize
t = 9/8 + √97/8
t = 9/8 + 1.23
t = 2.355secs
Hence the ball will hit the ground after 2.355 secs
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