The solution has been excellently provided by @aankurverma
Given, v0 = v0 j a = k(v x A) A = (-c/y) k
Now, a = (kc/y)vx j - (kc/y)vy i v y.dv y/dy = (kc/y)v x = (kc/y)  (v 2 - v y2) At maximum height, y m, the y component of velocity is zero. v0 0 [vy/ (v2 - vy2)]dvy = kc y0 ym (1/y)dy Integrating you should get the answer.
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