A stone thrown vertically upwards with an initial velocity u from the top of a tower reaches the ground with a velocity 3 u . the height of the tower is ?

H = (v² – u²) / (2g)

H = (9u² – u²) / (2g)

H = 8u² / (2g)

H = 4u²/g

Height of the tower is 4u²/g

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