Yes they collide

A boy projects a ball vertically upwards with speed 10 m/s from a point \(x\), which is 50 m above the ground. \(t\) seconds after the first ball is projected upwards, the boy drops second ball from \(x\). Initially the second ball is at rest. The balls collide 25 m above the ground.

Find the value of \(t\) in seconds.

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