Mathematics, 02.06.2021 08:10 dakulrzz3

The elevation at ground level is 0 feet. An elevator starts 90 feet below ground level. After traveling for 15 seconds, the elevator is 20 feet below ground level. Did the elevator travel up or down? What was the speed (in ft per second) of the elevator in the 15 second interval? PLEASE HELP I DONT UNDERSTAND

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