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Two stones A and B are projected simulta...

Two stones A and B are projected simultaneously as shown in figure. It has been observed that both the stones reach the ground at the same place after `7` sec of their projection. Determine difference in their vertical components of initial velocities in `m//s`. `(g=9.8 m//s^(2))`

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7
In time of gight i.e. `7` s, the vertical displacement of A is zero and that of B is 49 m so relative motion of B w.r.t. a `(u_(2)sin theta_(2)-u_(1)sintheta_(1))xx7=49rArr u_(2)sin theta_(2)-u_(1)sin theta_(1)=7 m//s`
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