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From your apartment balcony, 31 m above the ground, you throw a tennis ball straight down with a speed of 5.7 m/s. Simultaneously, your friend throws another tennis ball vertically upward with the same initial speed. When the first ball touches the ground, the vertical separation between the two balls is equal to /1 mark e check Valent a. 14 m O b. 23 m O c. 5.4 m O d. 33 m O e. 2.9 m