A bullet is fired vertically up from a 400 m tall tower with a speed 80 m/s. If g is taken as 10 m/s2, the time taken by the bullet to reach the ground will be

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A bullet is fired vertically up from a 400 m tall tower with a speed 80 m/s. If g is taken as 10 m/s<sup>2</sup>, the time taken by the bullet to reach the ground will be