Particles `P` and `Q` of masses `20g` and `40g`, respectively, are projected from positions `A` and `B` on the ground. The initial velocities of `P` and `Q` make angles of `45^(circ)` and `135^(circ)`, respectively with the horizontal as shown in the fig. Each particle has an initial speed of `49m//s`. The separation `AB` is `245m`. Both particles travel in the same vertical plane and undergo a collision. After the collision `P` retraces its path. The separation of `Q` from its initial position when it hits the ground is

Particles P and Q of mass 20g and 40g respectively are simu ltaneously proejected from points A and B on the ground. The initial velocities of P and Q make 45^(@) and 135^(@) angles respectivley with the horizontal AB as shown in the Fig. 5.44 Each particle has an initial speed of 49m/s . the separation AB is 249m. both particles travel in the same vertical plane and undergo a collision. After collision P retraces its path. Determine the position of q when it hits the grou.d How much time after the collision does the particle Q take to reach the ground? (Take g =9.8m//s^(2) )

Two particles P & Q are projected simultaneously from a point O on a level ground in the same vertical plane with the same speed in directions making angle of 30^(@) and 60^(@) respectively with the horizontal.

A particle of mass m strikes another particle of same at rest. Find the angle between velocities of particles after the collision , if the collision is elastic.

A particle is projected from ground with some initial velocity making an angle of 45^(@) with the horizontal. It reaches a height of 7.5 m above the ground while it travels a horizontal distance of 10 m from the point of projection. The initial speed of the projection is

A particle is projected with an initial velocity of 200 m//s in a direction making an angle of 30^(@) with the vertical. The horizontal distance covered by the particle in 3s is

A particle is projected from a point P with a velocity v at an angle theta with horizontal. At a certain point Q it moves at right angles to its initial direction. Then

Two particles P and Q are projected from two points in the same plane as shown. Find the condition for collision of two paricles.

A particle is projected with velocity 50 m/s at an angle 60^(@) with the horizontal from the ground. The time after which its velocity will make an angle 45^(@) with the horizontal is