Two particles are simultaneously projected in the same vertical plane from the same point with velocities u and v at angles `alpha and beta` with horizontal. Find the time that elapses when their velocities are parallel.

Two projectiles are thrown simultaneously in the same plane from the same point. If their velocities are v_(1) and v_(2) at angles theta_(1) and theta_(2) respectively from the horizontal, then ansewer the following questions The trajectory of particle 1 with respect to particle 2 wil be

A particle is projected with velocity u at angle theta with horizontal. Find the time when velocity vector is perpendicular to initial velocity vector.

Two particle are projected with same initial velocities at an angle 30^(@) and 60^(@) with the horizontal .Then

Two particles are projected at the same instant from the same point of inclinations alpha and beta to the horizontal.if they simultaneously hit the top and the bottom of a vertical pole subtending an angle gamma at the point of projection, show that tan -alpha tan beta=tan gamma .

Two particles are projected at the same instant with speeds v_(1) and v_(2) making angles alpha and beta with the horizontal as shown in the figure. Nelecting air resistance, the trajectory of the mass center the two particles

Two particles are projected simultaneously with same speed V_0 in same vertical plane at angle 30^@ and 60^@ With the horizontal .The time at which their velocities becomes parallel is