Answer:
A
Step-by-step explanation:
It only takes 5 seconds friend.
<u>The ball will take 5 seconds to hit the ground.</u>
The ball's h height after t seconds is given by the equation h = −16t² + 80t
When the ball hit the ground, the height will be zero.
∴ h = −16t² + 80t = 0
∴ −16t² + 80t = 0 take t as common
t ( -16t + 80) = 0
∴ t = 0 Or -16t + 80 = 0
-16t + 80 = 0
-16t = -80
t = -80/-16 = 5 seconds
<u>So, The ball will take 5 seconds to hit the ground.</u>
504
Step-by-step explanation:80/100 multiplied by 630
