How do I get to this answer? PHYSICS EXPERTS HELP :)?

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How do I get to this answer? PHYSICS EXPERTS HELP :)?



A rock is thrown vertically upwards with a velocity of 28 m.s−1 from the top of a 27 m high building. When it falls back down it just misses the building and falls to the ground. The acceleration due to gravity is 9.8 m.s−2. The total time of flight of the rock is nearest to: 

ANSWER: 6.55 s 

HOW do I get to this answer in the most simplest way? :) 10 points



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