Problem a target t lies flat on the ground 3 m from the, Ask an Expert

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Problem: A target t lies flat on the ground 3 m from the side of a building that is 10 m tall. A student rolls a ball off the horizontal roof of the building in the direction of the target. Air resistance is negligible.

Part A: What is the horizontal speed the ball must leave the roof?

I am not able to get the right solution please help me.

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