If v_(1) and v_(2) be the velocities at the end of focal chord of projectile path and u is the velocity at the vertex of the path, then

If v_(1) and v_(2) be the velocities at the end of focal chord of proj

1.	If v_(1) and v_(2) be the velocities at the end of focal chord of projectile path and u is the velocity at the vertex of the path, then
Answer» `(1)/(v_(1)) + (1)/(v_(2)) = (1)/(U)` `(1)/(v_(1)^(2)) + (1)/(v_(2)^(2)) = (1)/(u^(2))` `v_(1)^(2) + v_(2)^(2) = u^(2)` `u = v_(1) + v_(2)` ANSWER :B