Please help me! I don't even know where to begin with this problem!help!

In the figure, particle A moves along the line y= 31 m with a constant velocity ofmagnitude 2.5 m/s and parallel to thex axis. At the instant particle A passes they axis, particle B leaves the origin with zeroinitial speed and constant acceleration of magnitude0.31 m/s2. What angleθ between and thepositive direction of the y axis would result in acollision?
θ =

Section 4-4 Average Acceleration andInstantaneous Acceleration

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