# 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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