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Two shells are fired from a cannot with ...

Two shells are fired from a cannot with a speed u each, at angles of `alpha` and `beta` respectively to the horizontal. The time interval between the shots is T. they collide in mid-air after time t from the first shot. Which of the following conditions must be satisfied ?

A

`alpha gt beta`

B

`t cos alpha = (t-T) cos beta`

C

`(t-T) cos alpha = t cos beta`

D

`(u sin alpha) t - (1)/(2) g t^(2) = (u sin beta) (t-T) -(1)/(2) g(t-T)^(2)`

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The correct Answer is:
A, B, D
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