A particle is projected vertically upwards from a height 45 metres above the ground with...

WAEC 2006

A particle is projected vertically upwards from a height 45 metres above the ground with a velocity of 40 m/s. How long does it take it to hit the ground? [Take g = \(10 ms^{-2}\)].

A. 1s
B. 3s
C. 7s
D. 9s

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Correct Answer: Option D

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