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Which equation would best help solve the following problem?

Rennie kicks a field goal with an initial vertical velocity of 31 meters per second. How long will it take the football to hit the ground?

A–4.9t^2 + 31t = 0
B–4.9t^2 – 31t = 0
C16t^2 + 31t = 0
D–16t^2+ 31t = 0

Verified Answer :

Edufirst

y = yo + Vot - (gt^2)/2

0 = 0 + 31t - 4.9 t^2

0 = -4.9 t^2 + 31t

Answer: option A.

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