A particle is dropped from a building. It takes 4 sec for the particle to reach the ground

A particle is dropped from a building. It takes 4 sec for the particle to reach the ground. Then height of the building is (g=10m/s²)

(a) 20 m
(b) 40 m
(c) 80 m
(d) 75 m

80 m

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BH2001

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