Question: Two stones are thrown vertically up at the same time. The first stone is thrown with an initial velocity of 11.0m/s from a 12th-floor balcony

Two stones are thrown vertically up at the same time. The first stone is thrown with an initial velocity of 11.0m/s from a 12th-floor balcony of a building and hits the ground after 4.5s. With what initial velocity should the second stone be thrown from a 4th-floor balcony so that it hits the ground at the same time as the first stone? Make simple assumptions, like equal-height floors.

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