Question

Which equation would best help solve the following problem?



Hideki throws a baseball ball upward with an initial velocity of 12 m/s. When he throws the ball, it is 2 m above the ground. How long will it take the ball to hit the ground?





A.


–16t2+ 12t + 2 = 0


B.


–4.9t2 + 12t + 2 = 0


C.


–4.9t2 + 12t = 2


D.


4.9t2 + 12t + 2 = 0

Answer 1

@pinkbubbles

Answer 2

@pinkbubbles

Answer 3

–4.9t2+ 22t = 1.5 or –16t2+ 30t = 0 not sure what do you think?

Answer 4

i agree

Answer 5

umm i think the first one

Answer 6

@pinkbubbles ?

Answer 7

what makes you think is the 1st one?

Answer 8

hint: \(\bf \text{initial velocity}\\
h = -16t^2+v_ot+h_o \qquad \text{in feet}\\
h = -4.9t^2+v_ot+h_o \qquad \text{in meters}
\\ \quad \\

v_o=\textit{initial velocity of the object}\\
h_o=\textit{initial height of the object}\\
h=\textit{height of the object at "t" seconds}\)

Answer 9

that would be B then right @pinkbubbles

Answer 10

yup! c:

Answer 11

yeah