Physics - Kinematics Question with Solution | TestHub

It can be observed from figure that$\text{P}$and$\text{Q}$shall collide if the initial component of velocity of$\text{P}$and$\text{Q}$on inclined plane i.e along incline should be equal. That is particle is projected perpendicular to incline.



$\therefore$$\text{Time of flight T}=\frac{2{\text{u}}_{\perp }}{\text{ g}\text{ cos}\mathrm{ \theta }}=\frac{2\text{u}}{\text{ g}\text{ cos}\mathrm{ \theta }}$

$\therefore$$\text{u}=\frac{\text{g}\text{T }\text{cos}\mathrm{ \theta }}{2}=10\text{ m}/\text{s}$