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 projecti

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» `v_1^2 + v_2^2 = U^2` `(1)/(v_1^2) + (1)/(v_2^2) = (1)/(u^2)` `(1)/(v_1) + (1)/(v_2) = 1/u` `u = v_1 + v_2` ANSWER :B