Two straight lines `l_(1)` and `l_(2)` cross each other ar point P The line `l_(1)` is moving at a speed `v_(1)` perpendicular to itself & line `l_(2)` is moving at a speed `v_(2)` in the similar fashion. The speed of point P is :

Options

A. `sqrt((v_(1)v_(2))/(sinalpha))`
B. `sqrt(v_(1)^(2)+v_(2)^(2)+2(v_(1)+v_(2))^(2)cosalpha)/(cosalpha)`
C. `sqrt(v_(1)^(2)+v_(2)^(2)+2(v_(1)+v_(2))^(2)cosalpha)/(sinalpha)`
D. `((v_(1)+v_(2))+sqrt(v_(1)v_(2))cosalpha)/(cosalpha)`

Answer

C