Motion In A Plane

A particle is projected with velocity 100 mis at 30?. Time of flight is

The range of a particle projected at an angle of 15? with the horizontal is 1.5 km. Its range when projected with the same velocity at an angle of 45? with the horizontal is

A particle is moving eastward with velocity In 10 s the velocity changes to northwards. The average acceleration in this time is

Two boys are standing at ends and of a ground where . The boy at B starts running in a direction perpendicular to with a speed of ? The boy at A starts simultaneously with a velocity of and catches the other at time t where the time is