please make sure to provide correct solution, do not answer if you are unsure as this creates confusion. Thank you

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 k a. 14 m O b. 23 m O c. 5.4 m O d. 33 m O e. 2.9 m