1.

A stone is thrown vertically upwards with an initial speed `u` from the top of a tower, reaches the ground with a speed `3 u`. The height of the tower is :A. `(v^(2))/(g)`B. `(2v^(2))/(g)`C. `(4v^(2))/(g)`D. `(8v^(2))/(g)`

Answer» Correct Answer - C
According to the third equation of motion
`v^(2)-u^(2)=2as` given `v=3v,u=v and a=g`
or `(3v)^(2)-v^(2)=2gs or s=(4v^(2))/(g)`


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