1.

A ball is projected from the bottom of a tower and is found to go above the tower and is caught by the thrower at the bottom of the tower after a time interval t_1. An observer at the top of the tower see the same ball go up above him and then come back at this level in a time interval t_2 . The height of the tower is

Answer»

`1/2 G t_1 t_2`
`(g t_1t_2)/(8)`
`g/8 (t_1^2 - t_2^2)`
`g/2(t_1 - t_2)^2`

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