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A body falling from rest was observed to fall through 78.4 m in 2 seconds. Find how long had it been falling before it was observed?

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A body falling from rest was observed to fall through 78.4 m in 2 seconds. Find how long had it been falling before it was observed? 

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Δs is distance between travelled between t2 and t1.

∴ time travelled by ball before it was observed is 3s

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