Question

Can you explain it and help me out please​

Answer 1

D. 5.0

Explanation:

When the ball hit the ground, height h =0

So,

h= -4.9t² + 25t

0 = -4.9t² +25t

t(-4.9t+25)=0

t=0 (start) , and -4.9t+25=0, 4.9t =25, t≈5.1(finish)

D.5.0