You are making a video for your "Lit-Sports-Shots" channel on YouTube. You plan to drop a tennis ball from a 20 story building, and simultaneously shoot a tennis ball upwards from the ground directly under the dropped ball with a tennis ball machine at 200km/hr. The upper ball is dropped from 65m above the machine opening. At what time in s after the drop/shot will the balls collide?

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Projectile Motion