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**The problem:**

A boy kicks a ball horizontally near the edge of a boardwalk, with an initial speed of 9.0 m/s. A blowing wind gives the ball a constant horizontal acceleration of 12 m/s^2. The ball falls into the water directly under the boy. Ignore the effect of air resistance on the vertical motion of the ball.

A) Determine the height of the boardwalk above water.

B) If the blowing wind reverses direction while maintaining the same strength, where does the ball fall when it is kicked with the same initial speed?

I don't have much byway of an attempted solution for A (I haven't even looked at B yet) because I'm really not even sure where to start, but this is the information I know I have:

ax = 12m/s^2

ay = g = -9.8m/s^2

v0 = 9m/s

I tried to plug it into y = y0 + vy0t + 1/2ayt^2 to firstly find t, but I don't have vy0. In the other questions I've been doing, I've been given the angle in relation to the x axis, which allows me to find vy0 and vx0 using v0cosθ and v0sinθ, respectively. But I don't see how to find it with just the information I have.

So I'm left feeling rather lost regarding this question. Can anyone point me in the right direction?