Question: (10 m/s[up], 10 m/s[down]) 4. An arrow is shot straight up into the air at 40 m/s. As it falls back to Earth, acceleration due

(10 m/s[up], 10 m/s[down]) 4. An arrow is shot straight up into the air at 40 m/s. As it falls back to Earth, acceleration due to gravity is 10 m/s'[down], and the final velocity is 40 m/s. How long does it take the arrow to come back to the ground? (8.0 s)

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