You are standing very close to a building that is 15 m high and you throw a ball upwards from the ground with an initial velocity of 15 m/s. Your friend is on the roof of that building, and throws a second ball downwards with an initial velocity Vo.fi your friend throws the ball 0.25 second after you threw yours. Calculate the velocity VoF of your friend's ball if the two balls collided at the height of 10 m above the ground

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