Projectile Motion problem

1. The problem statement, all variables and given/known data







2. Relevant equations







3. The attempt at a solution



Maximum height attained by first projectile H = u²sin²θ/2g = 15m



If acceleration vector is assumed a = a_xi+a_yj , then at H √(a_x²+a_y²) = 50 .



Now I need to use the given conditions to come up with another equation . Not sure how to proceed .



Please help me with the problem .