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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